Advertisements
Advertisements
प्रश्न
An electric oven is rated as 1.5 kW, 250 V. If it is connected to a 250 V mains, calculate the
(a) Current drawn,
(b) Energy consumed in 20 hours,
(c) Cost of energy consumed in 20 hours at the rate of Re. 1 per unit.
Advertisements
उत्तर
Given, Power P = 1.5 kW, voltage V= 250 V
(a) Current, I= `"P"/"V" = (1.5 xx 1000)/250 = 6 "A"`
(b) Energy consumed in 20 hrs= P x t = 1.5 x 20 = 30 kWh
( c) Cost of consumed energy @Re. 1 per unit= 1 x 30 =Rs. 30
APPEARS IN
संबंधित प्रश्न
Choose the correct alternative and rewrite the following sentence.
When the resistance of a conductor increases, the current will ________ increase.
One coulomb of charge flows through any cross-section of a conductor in 1 second. What is the current flowing through the conductor?
The lamps in a house hold circuit are connected in parallel because:
(a) this way they required less current
(b) if one lamp fails the others remain lit
(c) this way they require less power
(d) if one lamp fails the other also fail
Consider the circuit given below when A, B and C are three identical light bulbs of constant resistance. 
(a) List the bulbs in order of increasing brightness.
(b) If C burns out, what will be the brightness of A now compared with before?
(c) If B burns out instead, what will be the brightness of A and C compared with before?
A 720 W heater operates from a 220 V line voltage. Calculate:
(a) The electrical energy consumed by the heater in 3 h.
(b) The cost of electrical energy consumption at the rate of 60 paise per kWh.
Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply. The resistance of each heater
What is meant by internal resistance of a cell?
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 |
What does the direction of current convey?
