Electricity

Question 1

How do you calculate efficency

Answer 1

efficiency = useful power out/ total power in

Question 2

Equation linking energy transferred, charge flow and potential difference

Answer 2

Energy transferred = charge flow x potential difference

Question 3

What is a renewable energy source?

Answer 3

A source that we can replace as fast as we use

Question 4

List 5 energy stores

Answer 4

Thermal, Kinetic, Gravitation potential, Elastic potential, Chemical, Magnetic, Electrostatic, Nuclear

Question 5

Voltage and frequency of UK mains electricity?

Answer 5

230v 50hz

Question 6

What is the value for gravity on Earth?

Answer 6

9.8 Newtons

Question 7

Why does increasing temperature increase resistance?

Answer 7

The atoms inside of a wire will vibrate more slowing passing current down and creating resistance.

Question 8

What are the units for charge?

Answer 8

Coulombs

Question 9

Advantages and disadvantages to nuclear energy

Answer 9

Nuclear energy is cheap to run, generate lots of energy and are reliable

Nuclear energy is a limited source, The waste is dangerous and they are expenssive to decommission

Question 10

How does current behave in a parallel circuit?

Answer 10

Current is shared between the loops of the circuit