EASY
Earn 100

How much time will be taken by a 100 W bulb to consume one unit of energy?

50% studentsanswered this correctly

Important Questions on Electricity

EASY
Science>Physics>Electricity>Electric Power
The practical unit of electrical energy 1 kWh means
HARD
Science>Physics>Electricity>Electric Power
A Refrigerator of 400 W power is run for 8 hours/day. What will be the cost of the energy to operate it for 30 days? (Rate Rs. 3.00 per kwh)
EASY
Science>Physics>Electricity>Electric Power
An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be
EASY
Science>Physics>Electricity>Electric Power
A heating unit of an electric stove is rated at 880 W. It is connected to a power supply of 220 V the current it will consume.
MEDIUM
Science>Physics>Electricity>Electric Power
An electric refrigerator rated 400 W is used for 8 hours a day. An electric iron box rated 750 W is used for 2 hours a day. Calculate the cost of using these appliances for 30 days, if the cost of 1 kWh is Rs.3/-.
EASY
Science>Physics>Electricity>Electric Power
Which of the following terms does not represent electrical power in a circuit ?
EASY
Science>Physics>Electricity>Electric Power
The cost of coal is Rs 5 per kg and can produce energy of 20 MJkg-1. If a power station uses coal to produce electricity with 25 % efficiency, then the cost of coal for producing 1 unit (1 kWh-1) of electricity in Rs.
EASY
Science>Physics>Electricity>Electric Power
Consider two circuits:
(i) A: in which N identical bulbs are connected in series across a battery of emf E.
(ii) B: in which N bulbs identical to those in A are connected in parallel across similar battery of emf E.
PA: Power dissipating in each bulb in A.
PB: Power dissipating in each bulb in B.
PAT : Total power delivered by battery in circuit A.
PBT : Total power delivered by battery in circuit B.
MEDIUM
Science>Physics>Electricity>Electric Power
An 100 watt electric bulb is lighted for two hours daily and four 40 watt bulbs are lighted for 4 hours daily. Calculate the energy consumed in (kWh) in 30 days. 
MEDIUM
Science>Physics>Electricity>Electric Power

There are 60 watt lamp and 80 watt fans in a house. The lamp and the fan run for 5 hours daily. Find out the expense in a month if a unit of electricity cost Rs.4/-(Assume that one month=30 days)

EASY
Science>Physics>Electricity>Electric Power
Which of the following term does not represent electric power (P) in electric circuit ?
EASY
Science>Physics>Electricity>Electric Power
In a household, five-tube lights of 40 W each are used for 5 hours and an electric press of 500 W for 4 hours every day. Calculate the total electrical energy consumed by the tube lights and press in a month of 30 days.
HARD
Science>Physics>Electricity>Electric Power

If the current through a resistor is increased by 50%, the increase in power dissipated will be (assume the temperature remains constant)

EASY
Science>Physics>Electricity>Electric Power
Commercial unit of electrical energy one kilowatt hr. (1 kWh) is equivalent to:
EASY
Science>Physics>Electricity>Electric Power
1 kWh=?
EASY
Science>Physics>Electricity>Electric Power
An electric bulb is connected to a 220 V generator. The current is 500 mA. What is the power of the bulb?
EASY
Science>Physics>Electricity>Electric Power
An electric bulb is rated 220 V, 100 W. It is operated on 110 V, then the power consumed will be :
HARD
Science>Physics>Electricity>Electric Power
There are 10 LED bulbs of 12 W each and 5 fans of 75 W each in a house. They are used for 10 hours per day. Prepare the bill for the month of February 2020 if the rate is Rs. 6 per unit. 
MEDIUM
Science>Physics>Electricity>Electric Power
An electric refrigerator rated 400 W and an electric bulb rated 100 W operates10  hours/day. What is the cost of the energy to operate it for 10 days at Rs 8.00 per kWh? 
EASY
Science>Physics>Electricity>Electric Power

A 200 W bulb is lighted for 2 hours. How much energy is consumed?