Symbol and Units

Question 1

V

Answer 1

potential difference measured in Volts (V)

Question 2

I

Answer 2

current measured in Amps (A)

Question 3

R

Answer 3

resistance measured in Ohms

Question 4

Q

Answer 4

charge measured in Coulombs (C)

Question 5

E

Answer 5

energy measured in Joules (J)

Question 6

t

Answer 6

time measured in seconds (s)

Question 7

P

Answer 7

power measured in Watts (W)

Question 8

E = Q x V

Answer 8

energy = charge x potential difference

joules = coulombs x volts

Question 9

V = E/Q

Answer 9

potential difference = energy/charge

volts = joules/coulombs

Question 10

V = I x R

Answer 10

potential difference = current x resistance

volts = amps x ohms

Question 11

I = Q/t

Answer 11

current = charge/time

amps = coulombs/seconds

Question 12

Q = I x t

Answer 12

charge = current x time

coulombs = amps x seconds

Question 13

R = V/I

Answer 13

resistance = potential difference/current

ohms = volts/amps

Question 14

P = E/t

Answer 14

power = energy/time

watts = joules/seconds

Question 15

P = I x V

Answer 15

power = current x potential difference

watts = amps x volts

Question 16

P = I² x R

Answer 16

power = currrent² x resistance

watts = amps² x ohms

Question 17

equation to measure energy

Answer 17

E = Q x V

Question 18

equation to measure potential difference using energy

Answer 18

V = E/Q

Question 19

equation to measure potential difference using charge

Answer 19

V = E/Q

Question 20

equation to measure potential difference using current

Answer 20

V = I x R

Question 21

equation to measure potential difference using resistance

Answer 21

V = I x R

Question 22

equation to measure current

Answer 22

I = Q/t

Question 23

equation to measure charge

Answer 23

Q = I x t

Question 24

equation to measure resistance

Answer 24

R = V/I

Question 25

equation for power using energy

Answer 25

p = E/t

Question 26

equation for power using time

Answer 26

p = E/t

Question 27

equation for power using potential difference

Answer 27

P = I x V

Question 28

equation for power using resistance

Answer 28

P = I² x R