Q. 1. What is heating of electric current ? [2]
Q. 2.Explain the cause of heating effect of current. [2]
Q.3. Obtain an expression for the heat developed in a resistor by the passage
of an electric current through it, by a suitable diagram. [3]
Q. 4. State Joule’s law of heating effect. [2]
Q.5. An electric current of 5.0 A flows through a 40 Ω resistor . Find out the
potential drop developed in the circuit and how much heat is produced in 20
minutes ? [3]
Q.6. A 20 V storage battery of negligible internal resistance is connected across
a 100 Ω resistor made of alloy manganin .How much current is developed and
how much heat energy is produced in the resistor in 30 minutes ? What is the source of this energy ?
Answers
Answer:
1)When an electric current passes through a conductor (like a high resistance wire) the conductor becomes hot after some time and produces heat. This is called heating effect of Electric Current. ... This is because of heating effect of electric current
2)
Cause of heating effect of current: When a potential difference is applied across the ends of a conductor, electrons get accelerated from negative terminal to positive terminal. ... At each collision, a part of kinetic energy of the electron gets converted into heat and this increases the temperature of the conductor.
4)
Joule's law of heating states that power of heating generated by an electrical conductor is proportional to the product of its resistance (R) and square of the electric current passing through the conductor with time.