Measurement and Calculation of Electricity Usage

Q.

What is a Thermister and what are its types?

Q. A fan of 60 W runs for 75 hours in a month. How much electrical energy is consumed?

Q. Calculate the amount of electricity bill to be paid for the month when 556 units of electricity is the reading of the electric meter in a month. The reading of the meter for the previous month is 423 units. Take the cost of one unit as Rs. 4.09.

1. Rs. 2274.04
2. Rs. 543.97
3. Rs. 4004.11
4. Rs. 1730.07

Q. 1 kW is equal to ________ W.

1. 1000
2. 10000
3. 100
4. 10

Q. When an appliance of 1 kW is used for 1 hour, then it would consume ________ of electricity.

1. 1 kWh
2. 1 unit
3. 10 kWh
4. 1000 Wh

Q. The brighter the bulb, the higher is its wattage and hence more is the electricity consumed by it.

1. True
2. False

Q. An electric kettle rated at 2.2 kW works for 4 hours in a day. Calculate the number of units consumed by it in 20 days.

Q. The list of home appliances and their corresponding wattages (for single equipment) and usage is given below. Calculate the amount to be paid as the electricity bill for one month (30 days). The cost of one unit of electricity is Rs. 3.08. Home Appliance Wattage (W) No. of hours used per day Computer Mixer Grinder Ceiling Fan Air conditioner 4 CFL Bulbs

100	10.5
450	2.15
60	9.5
1600	0.75
15	16

1. Rs. 209.75
2. Rs. 438.67
3. Rs. 877.34
4. Rs. 292.45

Q. The meter reading on 1st August shows 375 units and 430 units on 31st August. How much the owner would have to pay towards the electricity bill of August? (The cost of one unit of electricity is Rs. 4.26).

1. Rs. 1831.8/-
2. Rs. 467.6/-
3. Rs. 234.3/-
4. Rs. 1597.5/-

Q.

What is a short circuit?

Q.

If there any difference between 1 kW and 1 kWh? Explain.

Q. A bulb of 100 watt & an electric iron of 730 W are used for 2 hours daily . What is the total energy consumed in 10 days.

Q.

If $100J/s$ is the energy required for an appliance to run, what is the power consumed by it in watts, if it operates at $220V$?

1. 22 W

2. 22000 W

3. 100 W

4. 1000 W

Q. The electricity that we use at home to run appliances is __________ current.

1. direct
2. alternating
3. transforming
4. operating

Q.

What are the two types of electric current do we use in our daily life ?

Q. When an appliance of 2 kW is used for 1 hour, then it would consume ________ of electricity.

1. 2 kW
2. 2 units
3. 20 kWh
4. 20 units

Q.

How much money can be saved per month by using a compact fluorescent lamp of 15 W in place of an incandescent bulb of 100 W if they are used 8 hours per day for 30 days? (Take the cost of one unit of electrical energy as ₹2)

Q.

In a house, 3 bulbs of 25 W each are used for 5 hours a day. Calculate the unit of electricity consumed in a month of 32 days. Also, find the total expenditure if 1 unit of electricity costs ₹ 2.50.

Q.

SI unit for power is $\frac{Nm}{s}.$

1. True

2. False

Q.

Time taken for 60 W electric bulb to consume 3000 J energy is ___seconds.

1. 45

2. 100

3. 50

4. 40

Q. Name the quantity whose unit is (i) kilowatt, and (ii) kilowatt-hour.

Q. If 1 kW power is consumed for two hours, then power is consumed for one hour.

1. 0.5 kW
2. 3 kW
3. 2 kW

Q.

Amit spent the following amounts in the year $2012$ under various heads: electricity$36,142rs$, water charges $4,375rs$, and cooking gas$3,540rs$. Find the total amount spent by him under these heads.

Q.

Define $1kWh$.

Q. Calculate the no. of 'units' of electricity consumed for a month for the following details of electrical components in a household. Consider all the given components are used for 10 hours a day. (Take 1 month = 30 days)

Home Appliance	Wattage
6 ceiling fans	60 W each
4 CFLs	15 W each

1. 12600
2. 126
3. 1260
4. 12.6