Advertisements
Advertisements
Question
Write an expression for the electrical energy spent in flow of current through an electrical appliance in terms of current, resistance and time.
Advertisements
Solution
W = VQ but V = IR and Q = It
Electrical energy, W = E = I2 R t joule
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.
Name the S.I. unit of electrical energy. How is it related to Wh?
How do kilowatt and kilowatt-hour differ?
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.
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 : ________
Find out the energy conversion that takes place in the following.
Speaker ______.
Electrical energy is used to run electric trains.
What are the different forms of energy?
Electric eel is a ______.
What is electric energy?
What are the different ways electricity can be generated?
Write the uses of Electric energy.
Units of electrical energy are ______
Name the physical quantity which is measured in kWh.
A bulb of power 60 W is used for 12.5 h each day for 30 days. Calculate the electrical energy consumed.
