Electrical Circuits Quiz

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

• To increase the brightness of bulbs

• To connect or disconnect the circuit

• To store chemical energy

• To convert solar energy into electricity

Which of these is an example of an energy-saving appliance?

• Filament lamp

• LED lamp

• Electric heater

• Old refrigerator

What happens to the brightness of bulbs in a series circuit if you add more bulbs?

• Brightness increases

• Brightness stays the same

• Brightness decreases

• Bulbs stop working

How does a solar cell produce electricity?

• By burning fossil fuels

• By converting kinetic energy from wind

• By transforming sunlight into electrical energy

• By storing chemical energy

Why is it dangerous to plug too many devices into one socket?

• It makes the devices charge slower

• It can cause overheating and fires

• It wastes solar energy

• It increases the voltage of the circuit

In a parallel circuit with 3 bulbs and 2 dry cells, what happens to the other bulbs if one bulb is removed or burns out?

• All bulbs turn off

• Only the removed/burned-out bulb turns off

• The remaining bulbs become dimmer

• The dry cells stop working

In an experiment comparing circuits P, Q, and R that use different types of bulbs but the same number of dry cells, what is the constant variable?

• Number of bulbs

• Brightness of bulbs

• Number of dry cells

• Type of circuit

In this parallel circuit, bulbs are arranged in 3 paths: AB, CD, and EF. If bulb C explodes (🔥), which other bulb(s) will stop working?

• Bulb B

• Bulb D

• Bulbs F

• All bulbs (A-F)

Why are bulbs in a parallel circuit brighter than in a series circuit?

• They share equal voltage

• Each bulb receives the full voltage

• They are closer to the switch

• They use thicker wires

What should you do before touching a frayed wire on a lamp?

• Cover the wire with tape

• Turn off and unplug the lamp

• Test the wire with wet hands

• Add another bulb to the circuit