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Worksheets14 Electrical Current Bank - AI Draft
Total questions: 95
Worksheet time: 48mins
What carries the charge in a charged object?
Electrons
Protons
Neutrons
Photons
What is used as a conductor in most examples in this chapter?
Metal wire
Plastic rod
Glass tube
Rubber strip
Which law is used to solve simple circuit problems?
Ohm's Law
Newton's Law
Boyle's Law
Kepler's Law
What is the effect of a burn-out in a circuit?
Open circuit
Closed circuit
Short circuit
Parallel circuit
What is the unit of current related to?
Charge and time
Voltage and resistance
Power and energy
Mass and velocity
What happens to electrons when a negatively charged object touches the wire?
They move from the object to the ground.
They stay in the object.
They move from the ground to the object.
They disappear.
Why is the earth considered the "best ground available"?
It is the largest object around.
It is the smallest object around.
It has no charge.
It is made of metal.
Which way do electrons move in a wire?
From positive to negative.
From negative to positive.
In a circular motion.
They do not move.
Which way does conventional current flow in a conductor?
From negative to positive.
From positive to negative.
In a circular motion.
It does not flow.
How many amperes of current are caused by 2 C of charge flowing in 0.1 second?
20 A
10 A
5 A
2 A
How many amperes result from 60 microcoulombs (μC) flowing in 2 seconds? (1 μC = 10^-6 C)
3 x 10^-5 A
3 x 10^-4 A
3 x 10^-6 A
3 x 10^-3 A
From which terminal are electrons taken by the chemical action of the battery?
Positive
Negative
Neutral
Ground
From which terminal do electrons leave to flow through the wire?
Positive
Negative
Neutral
Ground
In what direction does the conventional current flow through the wire?
Positive to negative
Negative to positive
Neutral to ground
Ground to neutral
If 1 coulomb of charge flows across a 3-V battery, how does the energy given up compare to that given up by 1 C moving across a 1.5-V battery?
twice as much
half as much
the same
three times as much
Does an electron have more energy at the positive or negative terminal?
positive
negative
both the same
neither
Does positive charge have more energy at the positive or negative terminal?
positive
negative
both the same
neither
Three coulombs of charge flow across a 1.5-V battery. How much energy is lost by the electric charge?
4.5 J
3 J
6 J
1.5 J
How much charge must flow between the terminals of a 3-V battery to release 12 J of energy?
4 C
3 C
6 C
2 C
What is the effect of a resistor of greater resistance on current flow?
Increase it
Cut it down (reduce it)
Keep it the same
Double it
According to Ohm's Law, how is current (I) calculated?
I = R / ΔV
I = ΔV / R
I = R * ΔV
I = ΔV + R
What does the Greek letter omega (Ω) symbolize in the context of Ohm's Law?
Voltage
Current
Resistance
Power
What is the unit "ohm" expressed in terms of?
Volts/ampere
Amperes/volt
Watts/volt
Joules/ampere
If you use a 3-V battery to light a lamp with a resistance of 30 ohms, what is the resulting current?
0.1 A
0.3 A
1.0 A
3.0 A
What is the voltage of a common flashlight battery?
1.5 V
3.0 V
9.0 V
12.0 V
How are batteries connected when they are said to be "in series"?
Positive to negative
Positive to positive
Negative to negative
Parallel to each other
What is the total voltage (potential difference) across two batteries in series?
3V
1.5V
6V
0V
In general, how would you find the overall potential difference of batteries connected in series?
Add the individual voltages
Multiply the individual voltages
Subtract the individual voltages
Divide the individual voltages
How does the effective voltage of two batteries connected in series compare to that of the same two batteries connected in parallel?
Double
Half
Same
Zero
If the batteries of the figure are each 1.5V, what is the potential difference between points A and B?
1.5V
3V
0V
4.5V
What is the total resistance of the circuit of the figure in this frame?
12Ω
6Ω
4Ω
2Ω
Use Ohm’s law to find how much current will flow.
0.25 A
0.5 A
1 A
2 A
What is the voltage across the 4-ohm resistor?
1 V
1.5 V
3 V
0.5 V
What is the voltage across the 6-ohm resistor?
1 V
1.5 V
3 V
0.5 V
What is the sum of the voltages across all three resistors?
1 V
1.5 V
3 V
0.5 V
How does this compare to the voltage across the battery?
Less
More
The same
Double
In a series circuit, what is the total voltage across the battery equal to?
The sum of the voltage drops across the individual resistors
The voltage of the largest resistor
The voltage of the smallest resistor
The average voltage of all resistors
What happens to the charge as it moves through a 6-ohm resistor in the series circuit?
Gains 1.5V
Loses 1.5V
Gains 1V
Loses 0.5V
In a parallel circuit, how is the effective resistance $ R $ calculated?
$ R = R_1 + R_2 + R_3 + \ldots $
$ R = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3} + \ldots $
$ \frac{1}{R} = R_1 + R_2 + R_3 + \ldots $
$ \frac{1}{R} = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3} + \ldots $
What is the resistance of each resistor in the parallel circuit described?
2 ohms
4 ohms
6 ohms
8 ohms
Diagram showing voltage gains and drops in a series circuit and resistors in parallel
Voltage gains and drops are equal in a series circuit.
Resistors in parallel have the same voltage across them.
Voltage gains are higher than drops in a series circuit.
Resistors in parallel have different currents through them.
What is the effective resistance of three 6-ohm resistors in parallel?
2 ohms
3 ohms
6 ohms
9 ohms
If you have two resistors in parallel, one is 2 ohms and the other is 3 ohms, will the effective resistance be less than or greater than 2 ohms?
Less than
Greater than
Equal to
Cannot be determined
What is the value of the effective resistance for two resistors in parallel, one 2 ohms and the other 3 ohms?
5/6 ohms
6/5 ohms
1 ohm
2.5 ohms
In a parallel circuit with a battery of 3 V and an effective resistance of 2 ohms, what is the current through the battery?
0.5 A
1.5 A
2 A
3 A
In a parallel circuit, how does the voltage drop across each resistor compare to the voltage of the battery?
It is half the voltage of the battery
It is equal to the voltage of the battery
It is double the voltage of the battery
It is zero
Are the resistors in series or in parallel?
Series
Parallel
Neither
Both
Are the batteries in series or in parallel?
Series
Parallel
Neither
Both
How much is the potential difference across the battery combination?
3V
6V
9V
12V
How much is the resistance of the circuit?
1 ohm
2 ohms
3 ohms
4 ohms
How much current flows from the batteries?
1A
2A
3A
4A
How much current flows through the 12-ohm resistor?
0.5A
1A
1.5A
2A
How much current flows through the 4-ohm resistor?
0.5A
1A
1.5A
2A
Is your answer to the current from the batteries equal to the total of your answers to the current through the 12-ohm and 4-ohm resistors? Why?
No, because the current is divided unequally.
Yes, because the current divides to go through the two resistors and the sum of the parts equals the whole.
No, because the resistors are in series.
Yes, because the resistors are in parallel.
What happens to the other two lamps in a series circuit when one light bulb burns out?
They go out.
They stay lit.
They flicker.
They get brighter.
Does it make any difference which light bulb burns out in a series circuit?
Yes, only the first bulb matters.
No, they all go off no matter which burns out.
Yes, only the last bulb matters.
Yes, only the middle bulb matters.
If all your Christmas tree lights go out when a single bulb is removed, how are they wired?
In parallel
In series
In a loop
In a grid
In a parallel circuit, if two bulbs burned out, what would happen to the third bulb?
It would go out.
It would continue to burn.
It would flicker.
It would explode.
Are the circuits in your home wired in series or in parallel?
Series
Parallel
Both
Neither
What is the frequency of the alternating current (AC) used in the United States?
50 cycles per second
60 cycles per second
70 cycles per second
80 cycles per second
What type of current is used in a portable calculator?
Direct
Alternating
Top: AC, Bottom: DC
None of the above
What type of current is used to run an electric toaster?
Direct
Alternating
Top: AC, Bottom: DC
None of the above
Two graphs are shown in the figure, each plotting current as time passes. Label each of the graphs as representing AC or DC.
Top: AC, Bottom: DC
Top: DC, Bottom: AC
Both AC
Both DC
How many kilowatt-hours are used in burning a 100-W bulb for 8 hours?
0.8 kWh
1.2 kWh
0.5 kWh
1.0 kWh
Since the unit of kilowatt-hours appears on an electric bill, are you paying for power or energy?
Power
Energy
Voltage
Current
Suppose you pay 15 cents per kilowatt-hour. How much does it cost to watch a 300-watt TV for 6 hours?
27 cents
15 cents
45 cents
30 cents
To calculate the resistance of a light bulb that, when used in a 115-volt circuit, uses 100 watts of power, which formula will you use?
P = ΔV² / R
P = I²·R
P = ΔV / I
P = I·R
What is the numerical answer to the resistance problem?
132 ohms
115 ohms
100 ohms
87 ohms
How much current flows through the lamp?
0.87 A
1.15 A
0.75 A
1.00 A
How many watt-hours are in a kilowatt-hour?
1,000 watt-hours
100 watt-hours
10,000 watt-hours
500 watt-hours
How many seconds are in an hour?
3,600 seconds
1,800 seconds
2,400 seconds
4,200 seconds
If a watt is a joule/second, what is a joule in terms of watts and seconds?
1 watt-second
10 watt-seconds
100 watt-seconds
0.1 watt-second
One kilowatt-hour is how many joules?
3,600,000 J
360,000 J
36,000 J
3,600 J
One-half ampere flows from one terminal of a 3-volt battery to the other terminal for 5 seconds. How much energy is released?
7.5 joules
15 joules
1.5 joules
30 joules
What does the voltage of a battery tell us about the electric charge on the terminals of the battery?
The potential difference
The current flow
The resistance
The power output
Suppose a 9-volt battery is connected across a 100-ohm resistor. How much current will flow through the resistor?
0.09 amperes
0.9 amperes
0.009 amperes
9 amperes
If a greater potential difference is applied across a resistor, (more/the same/less) current will flow.
More
The same
Less
No current
Are the batteries in a conventional flashlight connected in series or in parallel?
Series
Parallel
Both
Neither
A "power beam" flashlight contains five regular D-cell batteries (1.5V each) in series. What is the voltage across these five batteries?
7.5 volts
5 volts
10 volts
6 volts
Fill in the blank with the correct option:
Option A
Option B
Option C
Option D
How much does it cost to operate a 1200-watt hair dryer for a half hour if electrical energy costs 10 cents per kilowatt-hour?
6 cents
10 cents
12 cents
15 cents
If two amperes of current flow through a 12-volt battery for one hour, how many coulombs of charge flow through the headlight?
3600 coulombs
7200 coulombs
2400 coulombs
4800 coulombs
How much power is being used if one-half ampere flows through a 40-ohm resistor?
5 watts
10 watts
20 watts
15 watts
What is the energy in joules when a charge of 2.5 C is moved across a potential difference of 3 V?
7.5 J
5 J
10 J
2.5 J
What does voltage represent in terms of charge?
Energy per charge
Charge per energy
Current per charge
Resistance per charge
According to Ohm's law, what happens to the current if the resistance increases?
Current decreases
Current increases
Current remains the same
Current becomes zero
What is the effective resistance of two resistors in series, one with 8 ohms and the other with 12 ohms?
20 ohms
4.8 ohms
10 ohms
18 ohms
How much does it cost to use 1.2 kW of power for 0.5 hours if the rate is 10 cents per kWh?
6 cents
12 cents
10 cents
5 cents
What is the charge in coulombs if the current is 2 A and the time is 1 hour?
7200 C
3600 C
1800 C
5400 C
How much energy in joules is stored if the charge is 7200 C and the potential difference is 12 V?
86,400 J
72,000 J
60,000 J
90,000 J
What is the power in watts if the potential difference is 24 V and the current is 1 A?
24 W
12 W
48 W
36 W
Calculate the power in watts if the current is 0.5 A and the resistance is 40 ohms.
10 W
20 W
15 W
5 W
What is the potential difference in volts if the current is 0.5 A and the resistance is 40 ohms?
20 V
10 V
15 V
25 V
What is the current in amperes if the potential difference is 3 V and the resistance is 18 ohms?
0.167 A
0.200 A
0.150 A
0.250 A
Calculate the potential difference in volts if the current is 0.167 A and the resistance is 6 ohms.
1 V
2 V
0.5 V
1.5 V
