Electricity

Ratna wants to find out which metal is the best electrical conductor.
What does she measure to determine which material is the best electrical conductor?

• the brightness of the lamp

• the color of the metal

• the length of the metal

• the temperature of the metal

Four types of materials are classified in the table below.
The materials are connected to the circuits shown in the electrical diagram.

In which arrangement will the bulb will light up?

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Sisca constructs four similar circuits.

The first circuit is a circuit with 3V battery, one bulb and straw.

The second is a circuit with 3V battery, one bulb and silver spoon

The third is a circuit with 3V battery, one bulb and plastic fork. 

The fourth is a circuit with 3V battery, one bulb and paper.

Which of the circuits with the bulb light up?

• The first circuit

• The second circuit

• The third circuit

• The fourth circuit

Evan places different objects between the wires.
He makes sure the ends of the wires touch the object.
Evan records if the lamp lights.

Here are his results.

According to the data, which objects do NOT let the electricity pass through?

• Object A and E

• Object B and E

• Object A, C and D

• Object B, C and E

1. Which one are the rules that we should NOT follow for electrical safety?
   

1.     Do not play with electrical sockets.

2.     Touch a switch with wet hands.

3.     Turn the switch on before pulling a plug out.

4.     Do not play with wires of electrical appliances.

5.     Dry your hands before touching electrical appliances.

6.     Stick any materials into the socket.

• 1, 3, 5

• 2, 3, 6

• 1, 3, 6

• 2, 3, 5

In which of the following circuits would NOT  the bulb light up?

• A

• B

• C

• D

In which of the following circuits would the bulb light up?

• A

• B

• C

• D

Materials that allows electricity to flow?

• Electrical Conducter

• Electrical Conductor

• Electrical Insulater

• Electrical Insulator

Materials that do not allow electricity to flow?

• Electrical Conducter

• Electrical Conductor

• Electrical Insulater

• Electrical Insulator

In the electrical circuit,
Jason puts the ends of the wires are dipped into a liquid to light up the bulb.

He observes that the bulb does not light up.

• Because the water is tap water that is insulator

• Because the water is distilled water that is insulator.

• Because the water is distilled water that is conductor.

• Because the water is tap water that is conductor.