In this worksheet, we will practice calculating the potential difference, current, and resistance at different points within simple parallel circuits.

**Q3: **

Isabella 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 decreases.
- BIt stays the same.
- CIt increases.

With still closed, is the resistance of the circuit lower than, higher than, or the same as it was when was open?

- AHigher
- BThe same
- CLower

and are kept closed, but is opened. Does the resistance in the circuit increase, decrease, or stay the same?

- AIt increases.
- BIt decreases.
- 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?

- AIncrease
- BDecrease

**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?

**Q11: **

The diagram shows two circuits. Are the circuits equivalent? If not, why not?

- ANo, because the cell is connected in a different direction
- BYes, the circuits are equivalent.
- CNo, because the branches of the circuit are connected in a different direction
- DNo, because one contains an ordinary diode and the other contains an LED
- ENo, because one shows the current flowing in a certain direction and the other does not

**Q12: **

The diagram shows four circuits. Which circuit contains two resistors in parallel?

- A(b)
- B(a)
- C(d)
- D(c)

**Q13: **

The diagram shows four circuits. Which one shows a fuse and a filament lamp connected to a cell in parallel?

- A(C)
- B(A)
- C(D)
- D(B)