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WorksheetsElectric Currents & Circuits
Total questions: 45
Worksheet time: 2hrs 30mins
The potential energy through a circuit (voltage)
potential difference
current
resistance
alternating current
The flow of electric charges
voltage
current
resistor
circuit
fuse
The opposition to the flow of electrons
current
resistance
voltage
power
Current that only flows in one direction
alternating current
direct current
fuse current
circuit current
Current that flows in more than one direction
alternating current
direct current
circuit current
fuse current
The rate at which electrical energy is used
power
current
circuits
resistance
A closed loop through which electrical charges can move
circuit
resistor
fuse
circuit breaker
Which of the following are safety devices for circuits if too much current flows through them?
fuse
circuit breaker
resistor
light bulb
battery
What conditions must be met for charges to flow through a circuit?
closed loop
potential difference (voltage)
fuse
generator
True or False: Voltage is the same as Potential Difference and is represented by the symbol (V)
True
False
The symbol for current is
I
C
A
V
Current is measured in
amperes
ohms
volts
seconds
The symbol for resistance is R
True
False
The unit for resistance is
volts
ampere
ohms
watts
Time is measured in
seconds
hours
light years
century
What is the unit for power?
watts
joules
seconds
hours
What does the variable E stand for?
Electrical field
Electric Current
Energy
Electrons
What is the correct circuit symbol for a battery?
What is the correct circuit symbol for a fuse?
What is the correct circuit symbol for a resistor?
What is the correct circuit symbol for a load?
What is the correct circuit symbol for a switch?
What do generators do?
convert mechanical to electrical energy
converts electrical to mechanical energy
What do batteries do?
converts mechanical energy to electrical energy
converts electrical to mechanical energy
converts chemical energy to electrical energy
converts electrical energy to chemical energy
What does a motor do?
converts mechanical energy to electrical energy
converts electrical energy to mechanical energy
Electric current that only flows in one directions
alternating
direct
Electric current that moves back and forth in two directions
alternating
direct
Which of the following factors effect resistance through a wire?
thickness
conductivity
length
boiling point
temperature
What do photocells do?
converts electrical to chemical energy
converts chemical energy to electrical energy
converts light energy to electrical energy
converts electrical energy to light energy
This type of conductor operates at temperature close to absolute zero and have no electrical resistance
superconductor
semiconductor
regular conductor
insulator conductor
For Ohm's Law current and voltage are what to each other?
directly proportional
inversely proportional
For Ohm's Law current and resistance are what?
directly proportional
inversely proportional
Why do some electrical plugs have a third prong?
Its allows more current to flow in a wire
grounds the device by sending excess electrons to the ground
are found on large home appliances
cause you to get shocked when plugging into the wall
What kills current or potential difference?
current
voltage
Why can birds sit on high voltage lines without being harmed?
because their bodies are at the same electric potential as the power line
they can see prey easily
they have shock resistance feet
they are immune to high current
Do you buy electrons from the power company?
Yes, we buy electrons
No, we buy energy
Yes, we buy current
No, we buy protons
What are two safety devices used in circuits?
fuses
circuit breakers
electrons
switch
battery
What is the standard voltage in a house?
220 V
110 V
120 V
150 V
How much current flows in a 175 Ω resistor when a voltage of 5.0 V is across it?
35 A
875 A
0.029 A
180 A
What is the resistance of a cold incandescent bulb filament if it draws a current of 0.43 A when plugged into a 120 V circuit?
280 ohms
51.6 ohms
120.43 ohms
0.00358 ohms
What voltage is applied to a 18.5 Ω resistor if the current is 7.3 A?
140V
0.394 V
135.05 V
25.8 V
What is the resistance of an electric frying pan which draws 5.8 amps when connected to a 120 V circuit?
21 ohms
0.0483 ohms
125.8 ohms
114.2 ohms
What current flows through a 100.0 W light bulb connected to a 20.0 V electrical source?
0.5 A
5 A
0.2 A
8 A
A small heater connected across a 220 V line dissipates 0.94 kW of power as heat. How much energy does this heater use if it operates for 7.5 hours?
7.1 kwh
0.125 kwh
7.97 kwh
8.44 kwh
What is the cost of operating an electric device that is rated at 350 W for 5.0 h a day for 30 days if the cost of electrical energy is $0.06/kWh?
$3.18
$17.50
$1.05
$1750
