Answers to AQA GCSE Series Circuit Calculations
Practice Questions
1.Calculate the resistance of the bulb in the circuit below
V = IR
I = V/R
I = 6/4 = 1.5A
2. Calculate the current flowing through the circuit below with the two resistors.
In a series circuit, total resistance is the sum of the individual resistors.
Total resistance = 4 ohms + 4 ohms = 8 Ohms
V = IR
I = V/R
I = 12/8 = 1.5A
Potential difference is shared between the components in a series circuit. 25V = 10V + V1
So, V1 = 25-10 = 15V, so V1 = 15V.
Next calculate the current that flows through the 1500ohm resistor
V = IR, so I = V/R
I = 15/1500 = 0.01A
In a series circuit, current is the same at all points in a circuit.
We can now calculate the value of resistor, R1
V =IR
R = V/I, R = 10V/0.01A = 1000 ohms
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