Ohm’s Law Practice Worksheet
Answer on your OWN paper. You MUST show ALL work to receive ANY credit
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How much current is in a circuit that includes a 9 volt battery and a bulb with a resistance of 3 Ω?
How much current is in a circuit that includes a 9 volt battery and a bulb with a resistance of 12 Ω?
A circuit contains a 1.5 volt battery and a bulb with a resistance of 3 Ω. Calculate current.
A circuit contains two 1.5 volt batteries and a bulb with a resistance of 3 Ω. Calculate the current.
What is the voltage of a circuit with 15 amps of current and a toaster of 8 Ω of resistance?
A light bulb has a resistance of 4 Ω and a current of 2 amps. Calculate the voltage drop.
How much voltage would be necessary to generate 10 amps of current in a circuit of 5 Ω resistance
How many ohms of resistance must be present in a circuit that has 120 volts and a current of 10
amps running through it?
9. An alarm clock draws 0.5 amps of current when connected to a 120 V circuit. What is its
resistance?
10. A portable MP3 player uses two batteries of 1.5 volts each. If the current in the MP3 player is 2 A,
what is the total resistance of the circuit?
11. You have a large flashlight that uses 4 D-cell batteries. If the current running through the
flashlight is 2 amps, what is the resistance of the light bulb? (Hint: all D-cell batteries have the
same voltage as the AA-cell batteries in your calculator)
Use the diagram below to answer the following 4 problems
12. What is the total voltage in each circuit?
13. How much current would be measured in each circuit if the light bulb has a resistance of 6 ohms?
14. How much current would be measured in each circuit if the light bulb has a resistance of 12 ohms?
15. Is the bulb brighter in circuit A or B? Why?
16. What happens to the current in a circuit if a 1.5 volt battery is replaced by a 9 volt battery?
17. In your own words, state the relationship between resistance and current in a circuit.
18. In your own words, state the relationship between voltage and current in a circuit.
19. What could you do to a closed circuit consisting of 2 batteries, 2 light bulbs, and a switch it
increase the current? Explain your answer.
20. What could you do to a closed circuit consisting of 2 batteries, 2 light bulbs, and a switch it
decrease the current? Explain your answer.
BONUS:
You have 4 1.5 volt batteries, a 1 Ω bulb, a 2 Ω bulb, and a 3 Ω bulb. Draw the schematic diagram
of a circuit for each of the following currents. There is more than one possible answer for each.
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6
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amperes
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