Worksheet: Parallel Circuits
In this worksheet, we will practice calculating the potential difference, current, and resistance at different points within simple parallel circuits.
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 increases.
- BIt stays the same.
- CIt decreases.
With still closed, is the resistance of the circuit lower than, higher than, or the same as it was when was open?
- AThe same
and are kept closed, but is opened. Does the resistance in the circuit increase, decrease, or stay the same?
- AIt decreases.
- BIt increases.
- CIt stays the same.
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?
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 ?
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 ?
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?
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?
The diagram shows two circuits. Are the circuits equivalent? If not, why not?
- ANo, because one contains an ordinary diode and the other contains an LED
- BNo, because one shows the current flowing in a certain direction and the other does not
- CYes, the circuits are equivalent.
- DNo, because the cell is connected in a different direction
- ENo, because the branches of the circuit are connected in a different direction
The diagram shows four circuits. Which circuit contains two resistors in parallel?
The diagram shows four circuits. Which one shows a fuse and a filament lamp connected to a cell in parallel?