D.C. Circuits

Question 1

Formula of Current in series circuit

Answer 1

I =I1 =I2 =I3

Question 2

Formula of Voltage in series circuit

Answer 2

V =V1+V2+V3

Question 3

Formula of Resistance in series circuit

Answer 3

R =R1+R2+R3

Question 4

Formula of Current in parallel circuit

Answer 4

I= I1+I2+I3

Question 5

Formula of Voltage in parallel circuit

Answer 5

V= V1 =V2 =V3

Question 6

Formula of Resistance in parallel circuit

Answer 6

1/R= 1/R1 + 1/R2 + 1/R3

Question 7

Formulas for potential divider (2 formulas)

Answer 7

V1 = Vin x R1/ (R1+R2)
or
Vout=VT x Rout/RT

Question 8

Advantages of cells in parallel arrangement (3 advantages)

Answer 8

1. Last longer before going flat
2. Able to supply higher current due to less internal resistance
3. One cell can be replaced without switching off the circuit