Ohms Law Practice Problems

Front

What is Ohm's Law?

Back

Ohm's Law states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) of the conductor. It can be expressed as V = IR.

Front

What is the formula to calculate resistance?

Back

Resistance (R) can be calculated using the formula R = V/I, where V is voltage and I is current.

Front

If a circuit has a voltage of 9 V and a current of 1 A, what is the resistance?

Back

Using Ohm's Law, R = V/I = 9 V / 1 A = 9 Ω.

Front

What is the unit of resistance?

Back

The unit of resistance is the Ohm (Ω).

Front

How do you calculate power in a circuit?

Back

Power (P) can be calculated using the formula P = IV, where I is current and V is voltage.

Front

What is Watt's Law?

Back

Watt's Law states that the power (P) in an electrical circuit is equal to the product of the current (I) and the voltage (V): P = IV.

Front

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

Back

Using Ohm's Law, V = IR = 5 Ω * 10 A = 50 V.

Front

What happens to current if resistance increases while voltage remains constant?

Back

If resistance increases while voltage remains constant, the current will decrease according to Ohm's Law.

Front

What is the relationship between voltage, current, and resistance?

Back

The relationship is defined by Ohm's Law: V = IR, meaning voltage is the product of current and resistance.

Front

If a device uses 240 V and draws 0.5 A, what is its resistance?

Back

Using R = V/I, R = 240 V / 0.5 A = 480 Ω.