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 is expressed as V = I × R.

Front

What is the formula to calculate current in a circuit?

Back

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

Front

Define voltage in the context of an electrical circuit.

Back

Voltage (V) is the electric potential difference between two points in a circuit. It is the force that pushes electric charges through a conductor.

Front

What is resistance in an electrical circuit?

Back

Resistance (R) is a measure of the opposition to the flow of electric current in a circuit. It is measured in ohms (Ω).

Front

How do you calculate the total resistance in a series circuit?

Back

In a series circuit, the total resistance (R_total) is the sum of the individual resistances: R_total = R1 + R2 + R3 + ...

Front

What is the unit of measurement for current?

Back

The unit of measurement for current is the ampere (A).

Front

If a circuit has a voltage of 12 V and a resistance of 4 Ω, what is the current?

Back

Using Ohm's Law, I = V / R = 12 V / 4 Ω = 3 A.

Front

What does it mean for a circuit to be closed?

Back

A closed circuit is one where the electrical path is complete, allowing current to flow. In contrast, an open circuit has a break in the path, preventing current flow.

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 voltage increases while resistance remains constant, current will also increase.

Front

What is the effect of increasing resistance on current in a circuit?

Back

Increasing resistance in a circuit, while keeping voltage constant, will result in a decrease in current.