WorksheetsOhm’s Law Classwork
Total questions: 30
Worksheet time: 25mins
Use Ohm’s Law (V = IR) to solve. A circuit has voltage 24 V and resistance 8 Ω. Calculate the current.
1 A
2 A
3 A
4 A
Use Ohm’s Law (V = IR) to solve. A circuit has voltage 24 V and resistance 8 Ω. What does the resulting current tell you about how easily electricity flows in this circuit?
Electricity flows easily because the current is relatively high for the given voltage
Electricity flows with difficulty because the resistance is extremely high
The circuit does not allow any current to flow (open circuit)
The current indicates electricity flows only momentarily then stops
Use Ohm’s Law (V = IR) to solve. A light bulb draws a current of 0.5 A when connected to a 6 V battery. What is the resistance of the bulb?
6 Ω
10 Ω
12 Ω
18 Ω
Use Ohm’s Law (V = IR) to solve. Two circuits have the same voltage 12 V but different resistances: Circuit A = 3 Ω, Circuit B = 6 Ω. Calculate the current in Circuit A.
1 A
2 A
3 A
4 A
Use Ohm’s Law (V = IR) to solve. Two circuits have the same voltage 12 V but different resistances: Circuit A = 3 Ω, Circuit B = 6 Ω. Calculate the current in Circuit B.
1 A
2 A
3 A
4 A
Use Ohm’s Law (V = IR) to solve. Two circuits have the same voltage 12 V but different resistances: Circuit A = 3 Ω, Circuit B = 6 Ω. Which circuit has the greater current, and why?
Circuit A, because lower resistance allows more current
Circuit A, because higher resistance blocks more current
Circuit B, because higher resistance allows more current
Circuit B, because lower voltage reduces current
Use Ohm’s Law (V = IR) to solve. A device needs 2 A of current to work properly and has resistance 10 Ω. What voltage is needed to power the device?
5 V
10 V
20 V
40 V
A device needs 2 A of current to work properly and has resistance 10 Ω. What might happen if the voltage is too low?
The current will be too low and the device may not work properly
The current will increase and the device will overheat
Voltage will stay the same and performance is unchanged
Resistance will drop to zero automatically
Use Ohm’s Law (V = IR) to solve. A student builds a circuit and measures voltage 18 V and current 3 A. Calculate the resistance.
3 Ω
6 Ω
9 Ω
12 Ω
Use Ohm’s Law (V = IR) to solve. A student builds a circuit and measures voltage 18 V and current 3 A. If the resistance increased while voltage stayed the same, what would happen to the current?
The current would increase
The current would decrease
The current would remain the same
The circuit would become an open circuit
Use Ohm’s Law (V = IR) to solve. A circuit has resistance 4 Ω. Calculate the current when the voltage is 8 V.
1 A
2 A
3 A
4 A
Use Ohm’s Law (V = IR) to solve. A circuit has resistance 4 Ω. Calculate the current when the voltage is 16 V.
2 A
3 A
4 A
6 A
A circuit has resistance 4 Ω. Compare the current when the voltage is 8 V versus 16 V. What pattern do you notice?
Current halves when voltage doubles
Current doubles when voltage doubles (directly proportional)
Current stays the same regardless of voltage
Current decreases when voltage increases
Use Ohm’s Law (V = IR) to solve. A phone charger provides 5 V and sends 1 A of current to a phone. What is the resistance of the phone?
1 Ω
3 Ω
5 Ω
10 Ω
Fill in the blanks using the word bank: voltage, current, resistance, volts, amps, ohms. Which term is the flow of electric charge?
voltage
current
resistance
amps
Which term is the push that moves electric charges?
voltage
current
resistance
ohms
Which term describes how much a material resists the flow of charge?
current
voltage
resistance
amps
Fill in the blanks using the word bank: voltage, current, resistance, volts, amps, ohms. Voltage is measured in which unit?
amps
ohms
volts
coulombs
Current is measured in which unit?
volts
amps
ohms
watts
Resistance is measured in which unit?
amps
ohms
volts
joules
Using Ohm’s Law, solve for current when voltage is 12 V and resistance is 4Ω . Choose the correct value of current.
1 A
2 A
3 A
4 A
Using Ohm’s Law, solve for resistance when voltage is 9 V and current is 3 A . Choose the correct value of resistance.
1 Ω
2 Ω
3 Ω
6 Ω
If voltage increases and resistance stays the same, current will do what? Circle the correct answer.
decrease
stay the same
increase
stop flowing
Which formula is used to find current? Circle the correct answer.
V = IR
I = V ÷ R
R = V ÷ I
Both A and B
A circuit has high resistance. What happens to the current? Circle the correct answer.
It increases
It decreases
It stays the same
It reverses direction
Answer in complete sentences: Why does adding resistance to a circuit cause the current to decrease?
Answer in complete sentences: How would increasing voltage affect the brightness of a light bulb?
A phone charger is designed to deliver the right amount of current to your phone. What could happen if too much current flows through a device?
A phone charger is designed to deliver the right amount of current to your phone. Why is resistance important in electronic devices?
Challenge (Optional): A circuit has a voltage of 18 V and a resistance of 6Ω . Calculate the current.
1 A
2 A
3 A
6 A
