Advertisements
Advertisements
Question
Advertisements
Solution
We know that,
P=VI
I = `"P"/"V" = (3 xx 1000)/250` = 12A
Thus, it can be used in a circuit which contains a 13A fuse.
APPEARS IN
RELATED QUESTIONS
If 20 C of charge pass a point in a circuit in 1 s, what current is flowing?
Which instrument is used to measure electric current? How should it be connected in a circuit?
A cell supplies a current of 1.2 A through two 2 Ω resistors connected in parallel. When the resistors are connected in series, it supplies a current of 0.4 A. Calculate:
(i) the internal resistance and (ii) e.m.f. of the cell.
An electric kettle has a heating element which is rated at 2 kW when connected to a 250 V electric supply. Calculate the
(a) Current which flows in the element when it is connected to a 250 V supply,
(b) Resistance of the filament,
(c) Heat produced in 1 minute by the element,
(d) Cost of running the kettle for 10 minutes a day for 30 days of the month, at the rate of Rs. 3.00 per unit.
State the condition when it is advantageous to connect cells in parallel.
Give the electric current unit.
Problems for practice:
If 3A current flows through a circuit, then convert the current in terms of a milliampere.
Match the items in column-I to the items in column-II:
| Column - I | Column - II |
| (i) electric current | (a) volt |
| (ii) potential difference | (b) ohm meter |
| (iii) specific resistance | (c) watt |
| (iv) Electrical power | (d) joule |
| (v) electrical energy | (e) ampere |
