9. The power supply voltage in this circuit is slowly increased. All the resistors are identical. Which of the 4 identical fuses would blow first?

fuses in a resistor network
10. A wire of resistance R , and radius r is replaced with a wire of radius 2r made of the same substance with the same resistivity and having double the length. The new resistance will be..
  • A. R/2
  • B. R
  • C. 2R
  • D. 4R

Q11 & 12.

A circuit is set up as shown. All the resistors are 2 Ω .

Circuit using 5 resistors in a network

  
11. The reading on the voltmeter is:
  • A. 0V
  • B. 2V
  • C. 4V
  • D. 6V
12. The reading on the ammeter is:
  • A. 3A
  • B. 6A
  • C. 7A
  • D. 9A

 

13. The circuit shown here consists of 2 identical resistors, and an ideal ammeter and ideal voltmeter.

 

What would happen to the current and voltage readings in this circuit if the ideal voltmeter is replaced with a voltmeter of similar resistance to the 2 resistors shown?

use of ideal meters - circuit diagram
  Voltmeter reading Ammeter reading
A increase increase
B decrease increase
C increase decrease
D decrease decrease

 

Q14-16.

A battery of e.m.f. 12V is connected to a 5Ω load resistor. 120C of charge flows through the resistor in one minute .

The battery has a significant internal resistance.

 

  
14. What is the current flowing through the resistor?
  • A. 0.5A
  • B. 2A
  • C. 10A
  • D. 1440A

15. What is the potential difference across the resistor?

  • A.2V
  • B.6V
  • C.10V
  • D. 12V
16. What is the internal resistance of the cell?
  • A. 1Ω
  • B. 2Ω
  • C. 4Ω
  • D. 10Ω