Electrical Systems and Uses of Electricity

One of simple action to conserve electricity that we can do is ...

• turn all the lights on

• open the refrigerator's door every time we want

• keep the AC on when there is nobody in the room

• switch off all electrical equipment that are not in use

These are how we use electricity safely, except...

• don't touch electricity with wet hands

• use electrical equipment with exposed wires

• don't put too many plugs into one socket

• make sure that electrical equipment have plastic or wooden handles

The meaning of the picture is...

• don't forget to wash your hands

• don't touch electricity with wet hands

• don't touch the wall

• don't touch the hand

What is the purpose of having a battery in the electrical circuit?

• It powers the electricity.

• It is an energy source.

• It contains chemicals.

• It has both the positive and negative terminals

What is part D?

• filament 
• glass bulb
• metal tip
• metal casing 

Larissa set up three electrical circuits using identical batteries and identical bulbs as shown below. The batteries and bulbs are all working properly.
Arrange the bulbs in the order of increasing brightness. 

• A, B, Z, C
• C, Z, B, A
• C, A, B, Z
• C, B, Z, A

Study the set-ups below.
Which of the following bulbs with light up?

• A and B only 
• B and C only 
• A, and C only
• A, B and C

The diagram below shows an electric bulb. If bulb A blows, how many bulbs will remain lit?

• 0
• 1
• 2
• 3

Shah sets up the circuit as shown in the diagram below. The bulb does not light up.
What should he do to make the bulb light up?

• Change the battery.
• Add another battery.
• Connect the wire to Z instead of Y.
• Connect the switch arm to X instead of Z.

Study the circuit diagram below.

Which one of the following will make each bulb in the circuit less bright?

• Removing one bulb from the circuit

• Removing the switch from the circuit

• Adding one bulb in series to the circuit

• Adding one battery in series to the circuit