Question

if current flowing through a fixed resistance is a halved what heat produced in it

Answer 1

1.

An electrical appliance has a resistance of 25 Ω. When this electrical appliance is connected to a 230 V supply line, the current passing through it will be:

A. 
0.92 A

B. 
2.9 A

C. 
9.2 A

D. 
92 A

2.

The potential difference across the 3 Ω resistor is:

A. 
1/9 V

B. 
1/2 V

C. 
2V

D. 
1V

3.

Two electric bulbs have resistances in the ratio 1:2. If they are joined in series, the energy consumed in them is in the ratio.

A. 
2:1

B. 
1:2

C. 
4:1

D. 
1:1

4.

You are given four ammeters A, B, C and D having least counts mentioned below: (I) Ammeter A with least count 0.25 A (II) Ammeter B with least count 0.5 A (III) Ammeter C with least count 0.05 A (IV) Ammeter D with least count 0.1 A Which of the ammeters would you prefer for doing an experiment to determine the equivalent resistance of two resistances most accurately, when connected in parallel?

A. 
Ammeter A

B. 
Ammeter B

C. 
Ammeter C

D. 
Ammeter D