CHAPTER 6 FORM 3

Which energy source is non-renewable?

• Solar

• Wind

• Natural gas

• Biomass

What is the correct energy conversion in a hydroelectric power station?

• Chemical → Heat → Electrical

• Gravitational potential → Kinetic → Electrical

• Nuclear → Heat → Electrical

• Solar → Heat → Electrical

A transformer has 1000 turns in the primary coil and 200 turns in the secondary coil. If the input voltage is 240V, what is the output voltage?

• 24V

• 48V

• 120V

• 240V

Why are step-up transformers used in power transmission?

• To increase current

• To reduce energy loss over long distances

• To convert AC to DC

• To decrease voltage

Which device uses a step-down transformer?

• Power station generator

• Household refrigerator

• High-voltage transmission lines

• Electric car battery

Which of these is NOT a renewable energy source?

• Geothermal

• Coal

• Tidal

• Solar

What happens if a transformer’s secondary coil has more turns than the primary coil?

• Voltage decreases

• Voltage increases

• Current stops

• Energy is lost

Which device directly converts sunlight into electricity?

• Wind turbine

• Solar panel

• Hydroelectric dam

• Biomass reactor

What is the main function of a fuse in an electrical circuit?

• To increase voltage

• To prevent circuit overload by melting when current is too high

• To store electrical energy

• To convert AC to DC

If a fuse is rated 5A, what happens when the current exceeds 5A?

• It glows brighter

• It melts and breaks the circuit

• It reduces voltage

• It stores the excess current