Advertisements
Advertisements
Question
Advertisements
Solution
We know that,
P=VI
I = `"P"/"V" = (5 xx 1000)/200` = 25A
Thus, safe limit of current through t he appliance is 25A and a fuse of rating BA cannot be used with an appliance of rating SkW, 200 v.
APPEARS IN
RELATED QUESTIONS
Why should the resistance of:
an ammeter be very small?
What is the conventional direction of the flow of electric current? How does it differ from the direction of flow electrons?
The p.d. across a 3 Ω resistor is 6 V. The current flowing in the resistor will be:
(a) `1/2A`
(b) 1 A
(c) 2 A
(d) 6 A
(a) With the help of a circuit diagram, obtain the relation for the equivalent resistance of two resistances connected in parallel.
(b) In the circuit diagram shown below, find:
(i) Total resistance.
(ii) Current shown by the ammeter A

Three resistors of 6.0 𝛀, 2.0𝛀 and 4.0𝛀 are joined to an ammeter A and a cell of e.m.f. 6.0 V as
shown in fig 8.52 Calculate:
(a) the effective resistance of the circuit and
(b) the reading of ammeter.
What is the function of a step-up transformer?
Small amounts of electrical current are measured in milliampere (mA). How many milliampere are there in 0.25 A ?
Water : pipe :: Electric current : ______.
