NT Science - Electricity 2

Which of the following is a step down transformer?

• A

• B

• C

• D

Which shows the correct connection of ammeters and voltmeters in a circuit?

• A

• B

• C

• D

Which of the following correctly shows the calculation of cost of electrical energy used?

• A

• B

• C

• D

What is the device used to measure the potential difference of a bulb in a circuit?

• ammeter

• resistor

• fuse

• voltmeter

What is the reason electricity is transmitted at high voltages?

• allow the use of transformer.

• allow the use of overhead cables

• safety reasons

• for energy conservation

Which of the following correctly indicates the bulb(s) which will light up when the indicated switch is closed?

• A

• B

• C

• D

An electric iron has a rating of 1200 W and 240 V.

What is the current flowing through the iron when it is switched on.

current = ___ A

An electric iron has a rating of 1200 W & 240 V.

Given one unit of energy costs $0.20, calculate the cost of using the iron for 30 minutes.

cost = $ ___

The diagram shows a transformer. Name the metal used to make the core of the transformer.

Which of the following does NOT help to reduce energy wastage?

• Using the fan and air conditioner at the same time

• switching off lights when leaving the classroom

• Using energy efficient bulbs