Download Ohm`s Law Practice Problems

S-6-6-2_Ohm’s Law and KEY
Ohm’s Law Practice Problems
Current
=
Voltage
or
I
=
Resistance
V
R
Units
Symbol
Symbol in Ohm’s law equation
Voltage
volts
V
V
Current
amps
A
I
Resistance
ohms
Ω
R
Part 1. Directions: Solve each problem below. Show your work.
1. A circuit has a voltage of 25 volts and a 5-ohm resistance. What is the current?
2. A CD player has a resistance of 40 ohms in a circuit that supplies 4 volts. What is the current
flowing through this circuit?
Part 2. Directions: Answer the questions below.
3. As the voltage in a circuit increases, what happens to the current?
4. As the resistance in a circuit increases, what happens to the current?
5. What would happen to the electrical current in the circuit below if you added another
battery and kept everything else the same? Explain your answer.
Source: www.eia.doe.gov/energyexplained/images/battery2_small.jpg
S-6-6-2_Ohm’s Law and KEY
ANSWER KEY
Ohm’s Law Practice Problems
Part 1. Directions: Solve each problem below. Show your work.
1. A circuit has a voltage of 25 volts and a 5-ohm resistance. What is the current? 5 amps
I = 25 volts/5 ohms
I = 5 amps
2. A CD player has a resistance of 40 ohms in a circuit that supplies 4 volts. What is the current flowing
through this circuit? 0.1 amps
I = 4 volts/40 ohms
I = 0.1 amps
Part 2. Directions: Answer the questions below.
3.
As the voltage in a circuit increases, what happens to the current? The current also increases.
4.
As the resistance in a circuit increases, what happens to the current? The current decreases.
5. What would happen to the electrical current in the circuit below if you added another battery and
kept everything else the same? Explain your answer. The current would increase because the
voltage would increase.
Source: www.eia.doe.gov/energyexplained/images/battery2_small.jpg