Chapter 8 Electricity - Formulae

Question 1

current with respect to charge

Answer 1

current (I) = charge (Q) / time (T)

Question 2

voltage with respect to work done and charge

Answer 2

voltage (V) = work done (W) / charge (Q)

Question 3

voltage formula/ohm’s law

Answer 3

voltage (V) = current (I) * resistance (R)

Question 4

energy formula

Answer 4

energy (E) = voltage (V) x charge (Q)

Question 5

energy formula with respect to time

Answer 5

energy (E) = voltage (V) x current (I) x time (T)

Question 6

energy formula with respect to resistance

Answer 6

energy (E) = current (I)^2 x resistance (R) x time (t)

Question 7

energy formula with respect to resistance without current

Answer 7

energy (E) = voltage (V)^2 x time (t)/resistance (R)

Question 8

power formula

Answer 8

power (P) = voltage (V) x current (I)

Question 9

power formula with respect to resistance

Answer 9

power (P) = current (I)^2 x resistance (R)

Question 10

power formula with respect to resistance without current

Answer 10

power (P) = voltage (V)^2/resistance (R)

Question 11

effective resistance formula (series)

Answer 11

Re = R1 + R2 + R3 + … + Rn

Question 12

effective resistance formula (parallel)

Answer 12

1/Re = 1/R1 + 1/R2 + 1/R3 + 1/R4 + … + 1/Rn