Series and Parallel Circuits

Question 1

Open Switch Circuit Symbol

Answer 1

Question 2

Closed Switch Circuit Symbol

Answer 2

Question 3

Cell Circuit Symbol

Answer 3

Question 4

Resistor Circuit Symbol

Answer 4

Question 5

Battery Circuit Symbol

Answer 5

Question 6

Diode Circuit Symbol

Answer 6

Question 7

Variable Resistor Circuit Symbol

Answer 7

Question 8

Filament Bulb Circuit Symbol

Answer 8

Question 9

Fuse Circuit Symbol

Answer 9

Question 10

Voltmeter Circuit Symbol

Answer 10

Question 11

Ammeter Circuit Symbol

Answer 11

Question 12

Thermistor Circuit Symbol

Answer 12

Question 13

Light Dependant Resistor (LDR) Circuit Symbol

Answer 13

Question 14

Light Emitting Diode (LED) Circuit Symbol

Answer 14

Question 15

Capacitator Circuit Symbol

Answer 15

Question 16

Bulb Brightness

Answer 16

Link explanations of brightness to power
Series:
Current is the same
P = I^2R so R ∝ P
Parallel:
P.D. across each branch is the same
P = V^2/R so P ∝ 1/R

Question 17

Resistance in Series

Answer 17

V = V1 + V2 + … = IR1 + IR2 + …
Current is constant: R = R1 + R2 + …
Giving Maximum Resistance
Applies to any closed loop
R(T) = ΣR(n)

Question 18

Resistance in Parallel

Answer 18

I =I1 + I2 + …
Kirchhoff’s First Law
V is constant across different branches
V/R = V1/R1 + V2/R2 + …
1/R = 1/R1 + 1/R2 + 1/R3
Providing Minimum Resistance

Question 19

Potential Difference Between Two Points

Answer 19

Find the Voltages at the points where the Voltmeter is connected between branches
Subtract the values to find the difference