Equations - Paper 1

Question 1

Charge?

Answer 1

Current x time

Q = I t

Question 2

Potential difference?

Answer 2

Current x resistance

V = I R

Question 3

Electrical Power (In terms of potential difference and current)?

Answer 3

Potential difference x current

P = V I

Question 4

Power (in terms of current and resistance)?

Answer 4

(Current²) x resistance

P = I²R

Question 5

power (in terms of energy and time) ?

Answer 5

Energy transferred / time

P = E/t

Question 6

Energy transferred (in terms of charges and potential difference)?

Answer 6

Charge x potential difference

E = Q V

Question 7

Density?

Answer 7

Mass / volume

d = m/v

Question 8

Period?

Answer 8

1 / frequency

Question 9

Boyle’s Law?

this is on the formula sheet

Answer 9

pV = constant

this is on the formula sheet

Question 10

Work done?

Answer 10

Force x distance moved

W = F D

Question 11

Resistance?

Answer 11

Potential difference / Current

R = V/I

Question 12

Efficiency?

Answer 12

Useful energy / Energy put in x100

E= useful/input x100

Question 13

Kinetic energy?

Answer 13

1/2 x Mass x Speed²

Ek=1/2mv²

Question 14

Gravitational potential energy?

Answer 14

Mass x Gravitational field strength x Height

Ep=mgh

Question 15

Elastic potential energy?

this is on the formula sheet

Answer 15

1/2 x Spring constant x Extension²

Ee=1/2ke²

(this is on the formula sheet)

Question 16

Specific heat capacity?

this is on the formula sheet

Answer 16

Energy / mass x temperature change

c = E / m x temp.

(this is on the formula sheet)

Question 17

Specific latent heat?

this is on the formula sheet

Answer 17

Energy / mass

l = E / m

(this is on the formula sheet)