Ohm's Law/Power

Front

What is Ohm's Law?

Back

Ohm's Law states that the current (I) 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 is expressed as V = I × R.

Front

What is the formula to calculate power in an electrical circuit?

Back

Power (P) in an electrical circuit is calculated using the formula P = V × I, where P is power in watts, V is voltage in volts, and I is current in amperes.

Front

What happens to current if voltage is increased while resistance remains constant?

Back

If voltage is increased while resistance remains constant, the current will increase.

Front

What is the unit of electrical resistance?

Back

The unit of electrical resistance is the ohm (Ω).

Front

If a circuit has a voltage of 24 V and a resistance of 6 Ω, what is the current?

Back

Using Ohm's Law, I = V/R = 24 V / 6 Ω = 4 A.

Front

What is the relationship between voltage, current, and resistance in a circuit?

Back

The relationship is defined by Ohm's Law: V = I × R, meaning voltage equals current multiplied by resistance.

Front

What is the power consumed by a device that operates at 10 A and 120 V?

Back

Using the power formula, P = V × I = 120 V × 10 A = 1200 W.

Front

If the resistance in a circuit is doubled while the voltage remains constant, what happens to the current?

Back

If the resistance is doubled while the voltage remains constant, the current will decrease by half.

Front

What is the voltage across a 10 Ω resistor carrying a current of 3 A?

Back

Using Ohm's Law, V = I × R = 3 A × 10 Ω = 30 V.

Front

What is the power in a circuit with a voltage of 50 V and a current of 2 A?

Back

Using the power formula, P = V × I = 50 V × 2 A = 100 W.