Ohm's Law and Simple Circuits

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 Current?

Back

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

Front

What is Voltage?

Back

Voltage, also known as electric potential difference, is the measure of the potential energy per unit charge available to drive the flow of electrons in a circuit.

Front

What is Resistance?

Back

Resistance is the opposition to the flow of electric current, measured in ohms (Ω). It determines how much current will flow for a given voltage.

Front

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

Back

Using Ohm's Law: I = V / R = 10 V / 5 Ω = 2 A.

Front

What is the unit of Resistance?

Back

The unit of resistance is Ohm (Ω).

Front

What is the relationship between Voltage, Current, and Resistance?

Back

The relationship is defined by Ohm's Law: V = I × R. This means that if you increase the voltage, the current will increase if resistance remains constant.

Front

What happens to the current if the resistance is doubled while keeping the voltage constant?

Back

If the resistance is doubled, the current will be halved, according to Ohm's Law (I = V / R).

Front

What is Power in an electrical circuit?

Back

Power (P) is the rate at which electrical energy is transferred by an electric circuit, calculated using the formula P = V × I.

Front

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

Back

Using the formula P = V × I: P = 12 V × 3 A = 36 W.