Electricity unit

Front

What is resistance in an electrical circuit?

Back

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

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). It can be expressed as V = I × R.

Front

What is the unit of electric current?

Back

The unit of electric current is the ampere (A).

Front

What is the difference between series and parallel circuits?

Back

In a series circuit, components are connected end-to-end, so the same current flows through all components. In a parallel circuit, components are connected across the same voltage source, allowing multiple paths for current.

Front

What happens to the total resistance in a series circuit?

Back

The total resistance in a series circuit is the sum of the individual resistances: R_total = R1 + R2 + R3 + ...

Front

What happens to the total resistance in a parallel circuit?

Back

The total resistance in a parallel circuit is less than the smallest individual resistance and can be calculated using the formula: 1/R_total = 1/R1 + 1/R2 + 1/R3 + ...

Front

What is a generator?

Back

A generator is a device that converts mechanical energy into electrical energy.

Front

What is an electric motor?

Back

An electric motor is a device that converts electrical energy into mechanical energy.

Front

What is voltage?

Back

Voltage, also known as electric potential difference, is the measure of the energy per unit charge available to drive electric current through a circuit, measured in volts (V).

Front

What is a lightbulb's resistance if it experiences 9 Volts and 3 amps of current?

Back

3 ohms.