Equations - Paper 1

Question 1

State the equation that links current, charge and time

Answer 1

Charge (C) = Current (A) x time (s)

Q = I t

Question 2

State the equation that links potential difference, current and resistance

Answer 2

Potential difference (V) = Current (A) x resistance (ohms)

V = I R

Question 3

State the equation that links power, potential difference and current

Answer 3

Power (W) = Potential difference (V) x current (A)

P = V I

Question 4

State the equation that links power, resistance and current

Answer 4

Power (W) = Current² (A) x resistance (ohms)

P = I²R

Question 5

State the equation that links power, energy and time

Answer 5

Power (W) = Energy transferred(J) / time (s)

P = E/t

Question 6

State the equation that links Energy, charge and potential difference

Answer 6

Energy (J) = Charge (C) x potential difference (V)

E = Q V

Question 7

State the equation that links density, mass and volume

Answer 7

Density (kg/m³) Mass (kg) / volume (m³)

d = m/v

Question 8

State the equation that links time period and frequency

Answer 8

T (s)= 1 / f (Hz)

Question 9

State the equation for Boyle’s Law? (this is on the formula sheet)

Answer 9

pressure (Pa) x Volume (m³) = constant

pV = constant (this is on the formula sheet)

Question 10

State the equation that links work done, force and distance

Answer 10

Work done (J) = Force (N) x distance moved (m)

W = F D

Question 11

State the equation that links resistance, potential difference and current

Answer 11

Resistance (ohms) = Potential difference (V) / Current (A)

R = V/I

Question 12

State the equation for Efficiency?

Answer 12

Efficiency = Useful energy out/ Total Energy input

E= useful/input

Question 13

State the equation for Kinetic energy?

Answer 13

Kinetic energy (J) = 1/2 x Mass (kg) x Velocity² (m/s)

E_k=1/2mv²

Question 14

State the equation for Gravitational potential energy?

Answer 14

GPE (J) = Mass (kg) x Gravitational field strength (N/kg) x Height (m)

Ep=mgh

Question 15

State the equation for Elastic potential energy? (this is on the formula sheet)

Answer 15

Elastic potential energy (J) = 1/2 x Spring constant (N/m) x Extension² (m)

Ee=1/2ke² (this is on the formula sheet)

Question 16

State the equation for Specific heat capacity (SHC)? (this is on the formula sheet)

Answer 16

SHC (J/kg^OC) = Energy (J) / mass (kg) x temperature change (^OC)

c = E / (m x Ø) (this is on the formula sheet)

Question 17

State the equation for Specific latent heat? (this is on the formula sheet)

Answer 17

Specific latent heat (J/kg) = Energy (J) / mass (kg)

L = E / m (this is on the formula sheet)