5-2 Circuits
Question 1
A cell with negligible internal resistance is connected as shown. The ammeter and the voltmeter are both ideal. What changes occur in the ammeter reading and in the voltmeter reading when the resistance of the variable resistor is increased?
Click here for the circuit:
https://drive.google.com/file/d/1eB1Rxx-vjK3g0e7Yh609Gc6EUqCJ3Uaz/view?usp=share_link
The change in the ammeter increases and in the voltmeter increases
The change in the ammeter increases and in the voltmeter decreases
The change in the ammeter decreases and in the voltmeter increases
The change in the ammeter decreases and in the voltmeter decreases
Question 2
Two resistors X and Y are made of uniform cylinders of the same material. X and Y are connected in series. X and Y are of equal length and the diameter of Y is twice the diameter of X. The resistance of Y is R.
What is the resistance of this series combination?
Click here for an image: https://drive.google.com/file/d/1RJNVmsZnGRDoHWoNwvYtkm8YX7uuU7XC/view?usp=share_link
Question 3
Three resistors are connected as shown. What is the value of the total resistance between X and Y?
Click here for the circuit:
https://drive.google.com/file/d/10P9VDqt5QyXrvnproAq9tYrZasGT-Gnw/view?usp=sharing
1.5 Ω
1.9 Ω
6.0 Ω
8.0 Ω
Question 4
Three identical light bulbs, X, Y and Z, each of resistance 4.0 Ω are connected to a cell of emf 12 V. The cell has negligible internal resistance. The switch S is initially open. Calculate the total power dissipated in the circuit.
Click here for the image of the circuit:
https://drive.google.com/file/d/1PBPCgZmw25-eCOnvndH5ticVKreR8C1E/view?usp=share_link
Question 5
Two conductors S and T have the V/I characteristic graphs shown in the link below. When the conductors are placed in the circuit below, the reading of the ammeter is 6.0 A. What is the emf of the cell?
Click here for the graph: https://drive.google.com/file/d/1r3K1IAUoj5fjb3Wq1iR1uy2MaNiSerRa/view?usp=sharing
4.0 V
5.0 V
8.0 V
13 V
Question 6
Three resistors of resistance 1.0 Ω, 6.0 Ω and 6.0 Ω are connected as shown. The voltmeter is ideal and the cell has an emf of 12 V with negligible internal resistance.
Click here to see the circuit:
https://drive.google.com/file/d/1u0q2XWVFavrviDiGoaNWJ1jfiRLAT4Af/view?usp=share_link
3.0 V
4.0 V
8.0 V
9.0 V
Question 7
The diagram shows a potential divider circuit used to measure the emf E of a cell X. Both cells have negligible internal resistance. State what is meant by the emf of a cell.
Click here for the image:
https://drive.google.com/file/d/18XBxSWlJnqVEhdU6rw54nuRTfYSYEIu7/view?usp=share_link
Question 8
AB is a wire of uniform cross-section and length 1.0 m. The resistance of wire AB is 80 Ω. When the length of AC is 0.35 m the current in cell X is zero. What is the resistance of the wire AC?
Click here for the image:
https://drive.google.com/file/d/18XBxSWlJnqVEhdU6rw54nuRTfYSYEIu7/view?usp=share_link
Question 9
AB is a wire of uniform cross-section and length 1.0 m. The resistance of wire AB is 80 Ω and of AC is 80 Ω. When the length of AC is 0.35 m the current in cell X is zero.
Determine E (the emf of cell X).
Click here for the image:https://drive.google.com/file/d/18XBxSWlJnqVEhdU6rw54nuRTfYSYEIu7/view?usp=share_link