Current Electricity

Question 1

Ohm’s law

Answer 1

Give relationship bw voltage (V) and current (I)
I = KV
Where ‘K’ is called coductance of conductor and its unit is of siemen & it is reciprocal of resistance
I = 1/R × V
V=IR => OHM’S LAW
Where ‘R’ is called resistance of conductor

Question 2

Ohm’s law graph

Answer 2

• its graph is plotted b/w current and voltage and it is a straight line
• the slope of ohm’s law gives conductance
• the reciprocal of slope gives resistance

Question 3

Resistance

Answer 3

When e- are moving in conductor these collide with atom and experience a resistance this is known as resistance.
The ratio of voltage and current is called resistivity.
R=V/I =>Volt/ Ampere =>ohm (sign)

Question 4

1 ohm

Answer 4

The resistance of a conductor is said to be 1 ohm if 1A current is flowing in it at p.d of 1 volt
- (Kilo) K (ohm sign) = 10^ 3
- (mega) M (ohm sign) = 10^6
- (giga) G ( ohm sign) = 10^9