Energy Conversions and Electrical Concepts Quiz

What is the overall energy conversion in a power station that is powered by fossil fuels?

• heat energy to electrical energy

• kinetic energy to electrical energy

• light energy to electrical energy

• potential energy to electrical energy

Answer explanation

In a fossil fuel power station, fossil fuels are burned to produce heat energy. This heat is then converted into electrical energy through turbines and generators, making 'heat energy to electrical energy' the correct conversion.

What happens to the current measured by the ammeter when lamp Q blows?

• The current would become 0 A.

• The current would decrease but not become 0 A.

• The current would increase.

• The current would remain the same.

Answer explanation

When lamp Q blows, it creates an open circuit, causing the current to decrease. However, if there are other paths for current to flow, it won't drop to 0 A, making the correct choice: the current would decrease but not become 0 A.

Electrical energy is a useful form of energy because it can be easily transferred from one place to another using wires and cables. Which of the following best completes the sentence?

• transferred

• destroyed

• created

• wasted

Answer explanation

The correct choice is 'transferred' because electrical energy can be easily moved through wires and cables, making it a versatile form of energy. The other options do not accurately describe the nature of electrical energy.

Which of the following is another way to reduce electrical energy wastage?

• Use energy-efficient appliances

• Use more appliances at the same time

• Keep windows open while using air conditioning

• Ignore energy labels on appliances

Answer explanation

Using energy-efficient appliances is a proven way to reduce electrical energy wastage, as they consume less power compared to standard appliances, leading to lower energy bills and reduced environmental impact.

What is used to boil water in a power station to produce steam?

• Generator

• Boiler

• Turbine

• Furnace

Answer explanation

A boiler is used in power stations to boil water, producing steam that drives turbines for electricity generation. The other options, like generator and turbine, do not perform this specific function.

How should a voltmeter be connected in a circuit to measure voltage across a lamp?

• In series with the lamp

• In parallel with the lamp

• Next to the battery

• In series with the switch

Answer explanation

To measure voltage across a lamp, the voltmeter should be connected in parallel with the lamp. This allows the voltmeter to measure the potential difference directly across the lamp without affecting the circuit's current.

In the circuit diagram, where should the voltmeter be placed to measure the voltage across the lamp?

• In series with the lamp

• In parallel with the lamp

• Next to the battery

• In series with the switch

Answer explanation

To measure the voltage across the lamp, the voltmeter should be placed in parallel with the lamp. This configuration allows the voltmeter to measure the potential difference directly across the lamp's terminals.

What is the purpose of using a graph like the one shown in the image for a science experiment?

• To visually represent the relationship between two variables

• To list all the equipment used in the experiment

• To write a summary of the experiment

• To record only the final result

Answer explanation

The graph visually represents the relationship between two variables, making it easier to analyze trends and patterns in the data collected during the science experiment.

Which label points to the Live Wire on the diagram?

Answer explanation

Label 0 correctly points to the Live Wire on the diagram, indicating its position accurately. Therefore, the correct answer is 0.

Which label points to the FUSE on the diagram?

Answer explanation

The label '0' correctly points to the FUSE on the diagram, indicating its position. Option D is incorrect as it does not correspond to the FUSE location.