Which of the switches should be closed so that only one bulb in the circuit is able to light up?

• A and C only

• B and C only

• A, B, and D only

• B, C, and D only

Which of the following are electrical conductors?

• A only

• A and B

• B and C

• A and C

Materials A, B, and C are connected as in the circuit. However, only bulb Y can light up. Why?

• becasue C is an electrical insulator

• B is an electrical insulator

• A, B and C are electrical insulators

• A and C are electrical conductors

What is the difference between LED and ordinary light bulb?

• Ordinary bulb last much longer than LED

• LEDs do not have filament that burn out and ordinary bulbs have it

• LEDs require a lot of electricity than ordinary bulbs.

• Ordinary bulbs give off a lot of heat than LEDs

Which circuit will have the brightest bulb?

• A

• B

• C

Which circuit will have the dimmer bulb?

• A

• B

• C

When more batteries are arranged in a circuit, . . . . electric current will flow through the bulb. the bulb will light up . . . . .

• more

• less

• brighter

• dimmer

When more bulbs are arranged in a circuit, . . . . electric current will flow through the bulbs. The bulbs will light up . . .

• more

• less

• brighter

• dimmer

The circuit does not work because . . .

• It only has one bulb

• It doesn't have enough battery

• the switch is opened

• it has too long wire

The wire on the cardboard is connected to the steel clips in a different way. Will the bulb light up when the circuit tester is connected to the steel clips B and F?

• No

• Yes