VCE Physics Unit 1 AOS 3 Electrical Energy

What is the unit of electrical energy?

• Joule

• Watt

• Volt

• Ohm

Which of the following is the correct equation relating power (P), current (I), and voltage (V)?

Which of the following devices converts electrical energy into light energy?

• Electric Motor

• Electric heater

• LED

• Electric bell

To measure the potential difference across a devise the voltmeter must be connected ...

• In series before the device.

• In series after the device.

• In parallel either side of the device.

• In parallel either side of the power source.

Which of the following devices is used to measure electric current?

• Voltmeter

• Ohmmeter

• Micrometer

• Ammeter

What happens to the brightness of a bulb when more bulbs are added in series to a circuit powered by a constant voltage source?

• The brightness increases.

• The brightness decreases.

• The brightness remains the same.

• The brightness fluctuates.

What is the relationship between current, voltage, and resistance in an electric circuit?

• Einstein's Law:

  I = RV

• Newton's Law:

  R = IV

• Faraday's Law:

  I = VR

• Ohm's Law:

  V = IR

Which of the following statements is true about resistors in a series circuit?

• The total resistance is equal to the sum of individual resistances.

• The total resistance is always less than smallest individual resistor.

• Greater resistance will draw greater current through the circuit.

• The total resistance is independent of the individual resistances.

What is the SI unit of electric current?

• Volt

• Ampere

• Ohm

• Watt

What is the main purpose of a circuit breaker in an electrical system?

• To interrupt the circuit in case of a fault

• To regulate the flow of current

• To prevent overcharging of batteries

• To measure the voltage in a circuit