Topic 8 Flashcards Preview

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Flashcards in Topic 8 Deck (15):
1

Give four ways you could increase the size of an induced current

Use a stronger magnet
Add an iron core
Add more coils
Add more voltage

2

What do transformers do?

Step up and step down the current

3

Transformers only work with which type of current?

Alternating current

4

Why is electricity transmitted at high voltage?

To reduce energy loss

5

How do you make an induced magnet?

Put them in a magnetic field range and they will attach to the magnet, each end will now be a pole and can attract other magnetic objects

6

What piece of equipment would you use to find the shape of a magnetic field?

Plotting compass

7

What is a permanent magnet?

A bar magnet

8

What is an electromagnet?

A coil of wire with a current flowing through it

9

How many coils of wire does a transformer have?

2

10

State the equation which links the potential difference and the current of the coils in a transformer

Vp X Ip = Vs X Is

11

What is the law of conservation of energy?

Energy is not created or destroyed

12

How does a step up transformer work?

Steps up voltage and decreases current

13

How does a step down transformer work?

Steps down voltage and increases the current

14

How does electromagnetic induction work in a transformer?

Primary coil induces voltage in secondary coil

15

What is a build up of static caused by?

Friction