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Flashcards in All the Electricity stuff Deck (22)
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1

When you rub an acetate rod with a cloth where do the electrons transfer?

Onto the cloth.

2

When you rub a polythene rod with a cloth where do the electrons transfer?

Onto the rod.

3

What is earthing?

When electrons move from an object to the earth, this discharges the object.

4

How does lightning occur?

Static electricity builds up in clouds and causes a huge spark.

5

Why must aircraft be earthed before they are refuelled?

To stop the charged aircraft causing a spark that could potentially ignite the fuel causing a fire.

6

Whats the name of the metal wire used to earth aircraft?

Bonding wire.

7

Where can static electricity be used?

Insecticide sprayers and electrostatic paint sprayers.

8

What is a direct current?

A current thats electrons only flows in one direction.

9

What's an alternating current?

A current thats electrons change direction many times a second.

10

What produces direct currents?

Cells/batteries.

11

What produces alternating currents?

Generators.

12

What is charge measured in?

Coulombs.

13

What do ammeters measure?

Current.

14

True or false:
Ammeters can be placed in series with other circuit components.

True.

15

Voltage is the same as _______ ___________.

Potential difference.

16

1 Volt = 1 _______ per _________

1 joule per coulomb

17

What does voltage measure?

The energy transfer from a component for each unit of charge.

18

What is meant by resistance?

How hard it is for a current to flow.

19

How is resistance measured?

Ohms.

20

True or false:
If voltage is applied to any side of a circuit containing a diode is will allow a current to flow.

False, diodes only conduct electricity in one direction.

21

LDRs have a _____ resistance in the dark and a _____ resistance with light.

high, low.

22

Thermistors have a _________ resistance when cold and a _________ resistance when hot.

high, low.