REvision Introduction to Circuits Quiz

Which component provides power to the circuit?

• A lamp

• A cell or battery

• A switch

• A motor

Answer explanation

A cell or battery provides the necessary electrical power to the circuit, enabling it to function. Other components like lamps, switches, and motors do not supply power; they utilize it.

What is used to measure the current in a circuit?

• An ammeter

• A voltmeter

• A thermometer

• A barometer

Answer explanation

An ammeter is specifically designed to measure the current flowing through a circuit. In contrast, a voltmeter measures voltage, a thermometer measures temperature, and a barometer measures atmospheric pressure.

What is the unit of current?

• Volts

• Amps

• Watts

• Joules

Answer explanation

The unit of current is measured in Amps (amperes). Volts measure voltage, Watts measure power, and Joules measure energy. Therefore, the correct answer is Amps.

What is the purpose of a circuit diagram?

• To show how components are connected

• To store energy

• To generate electricity

• To measure the current

Answer explanation

The purpose of a circuit diagram is to show how components are connected in an electrical circuit, making it easier to understand the layout and functionality of the circuit.

What is the symbol for potential difference?

• A

• J

• V

• W

Answer explanation

The symbol for potential difference, also known as voltage, is represented by 'V'. This is a standard notation in physics and electrical engineering, distinguishing it from other units like Joules (J) for energy and Watts (W) for power.

What is another name for potential difference?

• Power

• Voltage

• Current

• Resistance

Answer explanation

Potential difference is commonly referred to as voltage. It represents the difference in electric potential energy per unit charge between two points in a circuit.

How are ammeters connected in a circuit?

• In parallel

• In series

• In a loop

• In a grid

Answer explanation

Ammeters are connected in series to measure the current flowing through a circuit. This allows the ammeter to accurately gauge the total current, as it becomes part of the circuit path.

What is the function of a motor in a circuit?

• To produce light

• To spin when current flows

• To measure voltage

• To store energy

Answer explanation

The function of a motor in a circuit is to spin when current flows. This mechanical movement is generated by the interaction of magnetic fields and electric current, making it distinct from other components like lights or batteries.

What is the main function of a lamp in a circuit?

• To store energy

• To measure current

• To produce light

• To produce sound

Answer explanation

The main function of a lamp in a circuit is to produce light. It converts electrical energy into light energy, making it essential for illumination.

What is the role of a switch in a circuit?

• To measure voltage

• To produce light

• To temporarily break the circuit

• To store energy

Answer explanation

A switch is used to temporarily break the circuit, allowing control over the flow of electricity. When the switch is open, the circuit is incomplete, stopping the current.