# All the Electricity stuff Flashcards Preview

## Physics | GCSE - Edexcel - Additional > All the Electricity stuff > Flashcards

Flashcards in All the Electricity stuff Deck (22)
1
Q

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

A

Onto the cloth.

2
Q

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

A

Onto the rod.

3
Q

What is earthing?

A

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

4
Q

How does lightning occur?

A

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

5
Q

Why must aircraft be earthed before they are refuelled?

A

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

6
Q

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

A

Bonding wire.

7
Q

Where can static electricity be used?

A

Insecticide sprayers and electrostatic paint sprayers.

8
Q

What is a direct current?

A

A current thats electrons only flows in one direction.

9
Q

What’s an alternating current?

A

A current thats electrons change direction many times a second.

10
Q

What produces direct currents?

A

Cells/batteries.

11
Q

What produces alternating currents?

A

Generators.

12
Q

What is charge measured in?

A

Coulombs.

13
Q

What do ammeters measure?

A

Current.

14
Q

True or false:

Ammeters can be placed in series with other circuit components.

A

True.

15
Q

Voltage is the same as _______ ___________.

A

Potential difference.

16
Q

1 Volt = 1 _______ per _________

A

1 joule per coulomb

17
Q

What does voltage measure?

A

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

18
Q

What is meant by resistance?

A

How hard it is for a current to flow.

19
Q

How is resistance measured?

A

Ohms.

20
Q

True or false:

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

A

False, diodes only conduct electricity in one direction.

21
Q

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

A

high, low.

22
Q

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

A

high, low.