The amount of heat produced in a conductor is
(a) directly proportional to the square of the current flowing through the conductor
(b) directly proportional to the resistance of the conductor
(c) directly proportional to the time for which the current flows through the conductor
This is known as Joule's law of heating and it can be mathematically represented as:
where the symbols have their usual meanings.
If the current in the conductor is quadrupled, the heat generated in the conductor will become
Important Questions on Electricity
The amount of heat produced in a conductor is
(a) Directly proportional to the square of the current flowing through the conductor
(b) Directly proportional to the resistance of the conductor
(c) Directly proportional to the time for which the current flows through the conductor
This is known as Joule's law of heating and it can be mathematically represented as:
where the symbols have their usual meanings.
Keeping the current constant, the resistance is doubled. The heat generated will become
(a) directly proportional to the square of the current flowing through the conductor.
(b) directly proportional to the resistance of the conductor.
(c) directly proportional to the time for which the current flows through the conductor.
This is known as Joule's law of heating and it can be mathematically represented as:
where the symbols have their usual meanings.
If the current is passed through the conductor for double the time, the heat generated will become
Match the items in Column I to those in Column II.
| Column I | Column II |
| (a) | (p) |
| (b) | (q) |
| (c) , | (r) |
| (s) | |
| (t) |
Two identical immersion rod heaters are to be used to heat water in a large container. Which one of the following arrangements would heat the water faster:
(a) connecting the heaters in series with the mains supply?
(b) connecting the heaters in parallel with the mains supply?
