Energy and Voltage in Circuits
3 marks · EasyA circuit is shown below with a 6 V battery and two resistors, R1 = 3 Ω and R2 = 9 Ω, connected in series.
(a)[1 mark]
Calculate the total resistance of the circuit.
(b)[1 mark]
Calculate the current in the circuit.
(c)[1 mark]
Calculate the voltage across resistor R1.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) 12 Ω
(b) 0.5 A
(c) 1.5 V
Show mark scheme and worked solution
Marking points
M1 (a) · 1 mark · Adds resistances: R_total = R1 + R2
A1 (b) · 1 mark · Uses I = V / R correctly to find current. (follow-through)
A2 (c) · 1 mark · Uses V = IR for R1 with calculated current. (follow-through)
Worked solution
a) Total resistance: R_total = R1 + R2 = 3 Ω + 9 Ω = 12 Ω