Power and Ohm's law

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 can be expressed as V = I × R.

Front

What is current measured in?

Back

Current is measured in Amps (A).

Front

What is voltage?

Back

Voltage is the electrical potential difference between two points and is measured in Volts (V).

Front

What is resistance?

Back

Resistance is a measure of the opposition to the flow of electric current, measured in Ohms (Ω).

Front

What does power mean in electrical terms?

Back

Power is the rate at which electrical energy is transferred by an electric circuit, measured in Watts (W). It can also be defined as Joules transferred per second.

Front

How do you calculate power using current and voltage?

Back

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

Front

What is the formula to find resistance using voltage and current?

Back

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

Front

If a circuit has a voltage of 12V and a current of 3A, what is the resistance?

Back

The resistance is 4 Ohms (Ω). (R = V / I = 12V / 3A).

Front

What is the unit of power?

Back

The unit of power is Watts (W).

Front

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

Back

If resistance increases while voltage remains constant, the current decreases.