Lesson Worksheet: Parallel Circuits Physics • 9th Grade
In this worksheet, we will practice calculating the potential difference, current, and resistance at different points within simple parallel circuits.
Q1:
The diagram shows four circuits with components connected in parallel. Which two circuits are equivalent?
- A(a) and (d)
- B(c) and (d)
- C(a) and (b)
- D(b) and (c)
- E(b) and (d)
Q2:
Elizabeth sets up the circuit shown in the diagram. The current through the first ammeter, , is 5 A. What is the value of ? Give your answer to 1 decimal place.
Q3:
Emma sets up the circuit shown in the diagram. Each resistor has a resistance of 10 Ω.
The value of is initially 3 A. What is the value of ?
If is then closed, what happens to the value of ?
- AIt increases.
- BIt decreases.
- CIt stays the same.
With still closed, is the resistance of the circuit lower than, higher than, or the same as it was when was open?
- AThe same
- BHigher
- CLower
and are kept closed, but is opened. Does the resistance in the circuit increase, decrease, or stay the same from when all the switches were closed?
- AIt decreases.
- BIt increases.
- CIt stays the same.
Q4:
A student sets up the circuit shown in the diagram. Initially, switch 1 is closed and switch 2 is open. If she opens switch 1 and closes switch 2, will the current in the circuit increase or decrease?
- ADecrease
- BIncrease
Q5:
A student sets up the circuit shown in the diagram. Initially, the switch is open. When the student closes the switch, will the current flowing through the circuit increase or decrease?
- ADecrease
- BIncrease
Q6:
The circuit shown in the diagram consists of two resistors connected in parallel to a cell. The value of is equal to 30 A. What is the value of ?
Q7:
The circuit shown in the diagram consists of two resistors connected in parallel to a cell. The value of the current given by the second ammeter, , is 3 A. What is the value of ?
Q8:
A student sets up the circuit shown in the diagram. The three resistors are identical. The value of is 15 A. What is the value of ?
Q9:
A student sets up the circuit shown in the diagram. The value of is 8 A and the value of is 6 A.
What is the value of ?
What is the potential difference supplied by the cell to the circuit?
Q10:
The diagram shows two resistors connected in parallel to a cell. If the potential difference across the 3 Ω resistor is 18 V, what is the potential difference across the 6 Ω resistor?
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