Question

90,000 joules of work is required to transfer 81*10^23 electrons between two points of a resistor of 36Ω. The current passing through it is
A)2 A
B)4.2 A
C)2.5 A
D)16 A

Answer 1

Answer:

The work done when a unit charge is carried from “one point to another” is the potential difference.

V=\frac{1 J}{1 C}V=

1C

1J

\mathrm{V}=\frac{100}{20}V=

20

100

= 5 volts

Resistance is the property of any material to allow an electric current to pass through it or the opposing force of the material to electric flow.

The unit of resistance is ohms.

The formula for calculating resistance: R=\frac{v}{I}R=

I

v

where R is the ‘resistance’,

V is the ‘potential difference’,

I is the ‘current flowing’.

V= 5 volts

I = 2A

\mathrm{R}=\frac{5}{2}R=

2

5

= 2.5 ohms

Resistance = 2.5 ohms .

Answer 2

Answer:

C)2.5 A.......................