Advertisements
Advertisements
Question
List the names of three electrical gadgets used in your house. Write their power, voltage rating and approximate time for which each one is used in a day. Hence find the electrical energy consumed by each in a month of 30 days.
Advertisements
Solution
| Appliance | Power (w) | Voltage (v) | Time (hr) | |
| 1. | Electric fan | 60 | 220 | 1 hr |
| 2. | Refrigerator | 150 | 220 | `1/2` hr |
| 3. | Electric iron | 700 | 220 | `1/2` |
| Total | 220, v |
Energy consumed = 30 × `[(60/1000 xx 1) + (150/1000 xx 1/2) + 0.35]`
= 14.55 kwH
APPEARS IN
RELATED QUESTIONS
A bulb is connected to a battery of p.d 4 V and internal resistance 2.5 Ω. A steady current of 0.5 A flows through the circuit. Calculate:
- the total energy supplied by the battery in 10 minutes
- the resistance of the bulb and
- the energy dissipated in the bulb in 10 minutes.
Write an expression for the electrical energy spent in flow of current through an electrical appliance in terms of current, resistance and time.
Name the S.I. unit of electrical energy. How is it related to Wh?
When a current I flows through a resistance R for time t, the electrical energy spent is given by ______.
An electric toaster draws current 8 A in a circuit with source of voltage 220 V. It is used for 2 h. Find the cost of operating the toaster if the cost of electrical energy is ₹ 4.50 per kWh.
Find out the energy conversion that take place in the following.
Electric Iron box : _______ _______
Find out the energy conversion that takes place in the following.
Electric fan : ________
Electrical energy is used to run electric trains.
Electric eel is a ______.
Name the particles of atom?
Write the uses of Electric energy.
Choose the odd one:
The ground state energy of a hydrogen atom is - 13.6 eV When its electron is in the first excited state, its excitation energy is
Units of electrical energy are ______
Name the physical quantity which is measured in kWh.
Name the physical quantity which is measured in Wh.
