Ohm's Law

Front

What is the unit of electric current?

Back

Amps (A)

Front

What does Ohm's Law state?

Back

Voltage (V) = Current (I) x Resistance (R)

Front

How do you calculate Voltage using current and resistance?

Back

Voltage = Current x Resistance (V = I x R)

Front

What is the formula to find Resistance if Voltage and Current are known?

Back

Resistance = Voltage / Current (R = V / I)

Front

If a circuit has a current of 5 A and a resistance of 10 Ω, what is the voltage?

Back

Voltage = 5 A x 10 Ω = 50 V

Front

What is the relationship between Voltage, Current, and Resistance in a circuit?

Back

They are related by Ohm's Law: V = I x R.

Front

What resistance is needed to allow a current of 2 A to flow with a voltage of 12 V?

Back

Resistance = Voltage / Current = 12 V / 2 A = 6 Ω

Front

If the voltage across a resistor is 24 V and the current is 3 A, what is the resistance?

Back

Resistance = Voltage / Current = 24 V / 3 A = 8 Ω

Front

What happens to the current if the resistance in a circuit increases while the voltage remains constant?

Back

The current decreases.

Front

What is the current in a circuit with a voltage of 100 V and a resistance of 20 Ω?

Back

Current = Voltage / Resistance = 100 V / 20 Ω = 5 A