Advertisements
Advertisements
Question
Advertisements
Solution
An electric fuse is a safety device which is used to limit the current in an electric circuit. The use of a fuse thus safeguards the circuit and appliances connected in that circuit from being damaged.
A fuse is generally made of an alloy of lead and tin.
APPEARS IN
RELATED QUESTIONS
Give three reasons why different electrical appliances in a domestic circuit are connected in parallel.
An electric bulb is rated as 10 W, 220 V. How many of these bulbs can be connected in parallel across the two wires of 220 V supply line if the maximum current which can be drawn is 5 A?
Define the following:
Electromotive force
Find the effective resistance in the following circuit diagrams (Fig.):

An auto lamp is joined to a battery of e.m.f. 4 V and internal resistance 2.5Ω. A steady current of 0.5 A flows through the circuit. Calculate the
(a) Total energy provided by battery in 10 minutes,
(b) Heat dissipated in the bulb in 10 minutes.
Electrical power P is given by the expression P = (Q × V) ÷ time
(a) What do the symbols Q and V represent?
(b) Express the power P in terms of current and resistance explaining the meanings of symbols used there in.
State whether the following statement is True or False:
The SI unit of charge is the coulomb.
In current electricity, a positive charge refers to ______.
The power of an electric device is a product of ______ and ______.
