P2 - Generating electricity

Question 1

How can the current be increased in a dynamo?

Answer 1

• use a stronger magnet
• increase the number of turns of wire on the coil
• rotate the magnet faster

Question 2

How is energy produced in a power station?

Answer 2

1) coal is burned to heat water and produce steam
2) the steam turns the turbines
3) the turbine turns the generator which produces electricity

Question 3

What is the equation for efficiency?

Answer 3

Efficiency = useful energy output/total energy input x 100