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WorksheetsElectricity
Total questions: 80
Worksheet time: 31mins
An excess or shortage of electrons produces a net electric charge.
electric charge
electric forces
electric fields
static electricity
Like charges repel and opposite charges attract.
electric charge
electric forces
electric fields
static electricity
The strength of a field depends on the net charge and distance from the charge.
electric charge
electric forces
electric fields
static electricity
Charge can be transferred by friction, contact, and induction.
electric charge
electric forces
electric fields
static electricity
The two types of electric charge are positive and (a) .
In an atom, negatively charged electrons surround a positively charged nucleus.
True
False
If a neutral atom gains one or more electrons, it becomes a positively charged ion.
True
False
Which of the following statements are true about electric force?
Like charges attract and opposite charges repel.
Electric force is the attraction or repulsion between electrically charged objects.
Electric force is inversely proportional to the amount of charge.
Electric force is inversely proportional to the square of the distance between two charges.
Inside an atom, electric forces are (a) than gravitational forces.
Which of the following are factors that the strength of an electric field depends on?
the direction of the field
whether the charge is positive or negative
the amount of charge that produces the field
the distance from the charge
The field of a negative charge points away from the charge.
True
False
Charges can be transferred by friction, contact, and induction.
True
False
What states that the total charge in an isolated system is constant?
(a)
Rubbing a balloon on your hair is an example of charging by (a) .
Which of the following statements are true about charging?
When you rub a balloon on your hair, your hair loses electrons and becomes positively charged.
The sphere of a Van de Graaff generator transfers all of its charge to you when you touch it.
Induction occurs when charge is transferred without contact between materials.
Static charges cannot move.
Static discharge occurs when a pathway through which charges can move forms suddenly.
True
False
What is the voltage if a resistance of 25 ohms produces a current of 250 amps?
*Answer using the abbreviation of the unit.
(a)
What is the current produced by a voltage of 240 volts through a resistance of 0.2 ohms?
*Answer using the abbreviation of the unit.
(a)
What voltage is necessary to produce a current of 200 amps through a resistance of 100 ohms?
*Answer using the abbreviation of the unit.
(a)
What resistance would produce a current of 120 amps from a 6-volt battery?
*Answer using the abbreviation of the unit.
(a)
What is the current produced by a 9-volt battery flowing through a resistance of 200 ohms?
*Answer using the abbreviation of the unit.
(a)
What voltage produces a current of 500 amps with a resistance of 50 ohms?
*Answer using the abbreviation of the unit.
(a)
What resistance would produce a current of 200 amps with a voltage of 2,000 volts?
*Answer using the abbreviation of the unit.
(a)
What is the current produced with a 9-volt battery through a resistance of 100 ohms?
*Answer using the abbreviation of the unit.
(a)
What current flows through a hair dryer plugged into a 120 volt circuit if it has a resistance of 25 ohms?
*Answer using the abbreviation of the unit.
(a)
A subwoofer needs a household voltage of 110 volts to push a current of 5.5 amps through its coil. What is the resistance of the subwoofer?
*Answer using the abbreviation of the unit.
(a)
What is the formula for calculating voltage (V)?
V = I x R
V = I/R
V = R/I
V = I + R
What is the formula for calculating current (I)?
I = V/R
I = R/V
I = V x R
I = V + R
What is the formula for calculating resistance (R)?
R = V/I
R = I/V
R = V x I
R = V + I
What is missing from this measurement?
0.4
significant figures
unit
measurement
amount
1 volt is equivalent to 1 (amp x ohm)
True
False
Which direction does electric charge flow in direct current?
one direction
two directions
Which direction does electric charge flow in alternating current?
one direction
two directions
Electrons flow in the wire from a(n) (a) terminal to a positive terminal.
A(n) (a) is a material through which electric charge can flow easily.
A(n) (a) is a material through which charge cannot flow easily.
Metals are good conductors because they do not have freely moving electrons.
True
False
Is the following material a conductor or insulator?
copper
conductor
insulator
Is the following material a conductor or insulator?
silver
conductor
insulator
Is the following material a conductor or insulator?
plastic
conductor
insulator
Is the following material a conductor or insulator?
rubber
conductor
insulator
Is the following material a conductor or insulator?
wood
conductor
insulator
Which of the following factors below does not affect a material's resistance?
its length
its temperature
its velocity
its thickness
A(n) (a) is a material that has almost zero resistance when it is cooled to low temperatures.
A device that converts chemical energy to electrical energy.
flow of charge
voltage
battery
Requires a complete loop.
flow of charge
voltage
battery
The difference in electrical potential energy between two places in an electric field.
flow of charge
voltage
battery
Three common voltage sources are batteries, solar cells, and generators.
True
False
According to Ohm's law, the voltage in a circuit equals the product of the energy and the resistance.
True
False
Doubling the resistance in a circuit will halve the current if voltage is held constant.
True
False
Doubling the voltage in a circuit doubles the current if (a) is held constant.
(a) is a measure of the rate at which electrical energy is converted to another form of energy.
(a) is the energy associated with electric charges.
What is missing from the equation for electrical energy below?
E = (a) x t
* Use the abbreviation of the variable to answer.
What is missing from the equation below for electric power below?
P = I x (a)
* Use the abbreviation of the variable to answer.
A clothes dryer uses about 27 amps of current from a 240-volt line. How much power does it use?
*Answer using the abbreviation of the unit.
(a)
A camcorder has a power rating of 2.304 watts. If the output voltage from its battery is 7.2 volts, what current does it use?
*Answer using the abbreviation of the unit.
(a)
A power tool uses about 12 amps of current and has a power rating of 1440 watts. What voltage does the tool require?
*Answer using the abbreviation of the unit.
(a)
A stereo receiver uses a current of 2.2 amps from a 120-volt line. What is its power?
*Answer using the abbreviation of the unit.
(a)
A television connected to a 120-volt line uses 102 watts of power. How much current flows through it?
*Answer using the abbreviation of the unit.
(a)
A lamp with a 45 W bulb is plugged into a 120-volt outlet. What is the current in the lamp?
*Answer using the abbreviation of the unit.
(a)
A 15 W speaker is connected to a 12-volt power supply. What is the electric current running through the speakers?
*Answer using the abbreviation of the unit.
(a)
A 240 W speaker is connected to a 12-volt power supply. What is the electric current running through the speakers?
*Answer using the abbreviation of the unit.
(a)
One day, a television with a power rating of 200 W used 0.8 Wh. How many hours was the TV on this day?
*Answer using the abbreviation of the unit.
(a)
What unit will be used with the measurement answer for the question below?
A calculator uses a 9-volt battery and draws 0.1 amps. How much power does it use?
kWh
W
V
A
A number of light bulbs are connected to an energy source in a series circuit. What will happen to the other bulbs if one of the bulbs burns out?
Nothing will happen.
They will be brighter.
They will be dimmer.
They will turn off.
In a series circuit, if one element stops functioning, then none of the elements can operate.
True
False
A ground-fault circuit interrupter is a switch that opens to prevent overheating when the current in a circuit is too high.
True
False
If a short circuit develops, the current takes an easier path to ground through the (a) wire.
The transfer of excess charge through a conductor to Earth is called (a) .
A (a) shows one or more complete paths in which charge can flow.
What does the symbol below indicate on a circuit diagram?
+
The direction of current
A negative terminal
A positive terminal
What does the symbol below indicate on a circuit diagram?
-
The direction of current
A negative terminal
A positive terminal
What does the symbol below indicate on a circuit diagram?
-->
The direction of current
A negative terminal
A positive terminal
Circuits in a home are rarely wired in parallel.
True
False
If one light goes out in a (a) circuit, the rest of the lights can still operate.
What would not happen if the current in a wire exceeds the circuit's safety limit.
The wire could get cooler.
A fuse could blow.
A fire could start.
Which of the following terms are used as equipment to prevent current overload?
fuse
three-pronged plug
insulation
grounding wire
circuit breaker
Which of the following terms are used as equipment to protect people from electric shock?
fuse
three-pronged plug
insulation
grounding wire
circuit breaker
Which of the following terms are used as equipment to prevent short circuits?
fuse
three-pronged plug
insulation
grounding wire
circuit breaker
