1.
An electric heater is marked 2000 W,200 V.
The resistance of the coil is 20 ohm.
2.
The current in a circuit having constant
resistance is tripled. The power increases 9
times.
3.
What voltage drop will be there across a 1
kW electric heater whose resistance when hot is 40 Ohms? Ans:
200 V
4.
In the case of liquids, ohms law is fully obeyed.
5.
A copper wire has a resistance of 10 ohms.
It is stretched by one-tenth of its original length. Then its resistance will be
- 12.1 ohms.
6.
No current flows between two charged bodies
if they have same potentials.
7.
Best materials for making connecting wires-
copper
8.
The specific resistance of the
material of wire depends on the material out of which the wire is made.
9.
Ampere- second is the
unit of Charge.
10.
The percentage by which the
incandescence of lamp decreases due to drop of current by 3% is-6%.
No comments:
Post a Comment