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