Advertisements
Advertisements
Question
How does the heat produced by die passage of current in a metallic wire depend on the time of passage of current in the wire?
Advertisements
Solution
The heat produced is proportional to the time of passage of current in the wire.
RELATED QUESTIONS
What is meant by "electric power"?
Electrical power p is given by the expression P = (Q × V) ÷ time. Express the power P in terms of current and resistance explaining the meaning of symbols used there in.
The diagram shows a coil connected to a center zero galvanometerG . The galvanometer shows a deflect ion to the right when the north pole N of a powerful magnet is moved to the right as shown .

(i) Explain, why the defelct ion occurs in the galvanometer.
(ii ) State whether th e current in the coil is cl ockwise or anticl ockwise
when viewed from the end P.
(iii ) State th e observation in G when the coil is moved away from north
pole N of the magnet keeping the magnet stationary.
(iv)State the observation in G when both the coil and the magnet are
moved to right at th e same speed .
An electric bulb of resistance 500 Ω draws current 0.4 A from the source. Calculate:
- the power of bulb and
- the potential difference at its end.
Name two common material used for heating elements.
How does the heat produced by die passage of current in a metallic wire depend on the resistance of the wire.
How does earthing prevent electrical shock?
At what voltage is the electric power generated at the generating station? Explain the transmission of this power to your house.
A bulb is connected to a battery of e.m.f. 6V and internal resistance 2Ω A steady current of 0.5A flows through the bulb. Calculate the total energy supplied by the battery in 10 minutes.
