Advertisements
Advertisements
प्रश्न
Sumit does 600 J of work in 10 min and Amit does 300 J of work in 20 min. Calculate the ratio of the powers delivered by them.
Advertisements
उत्तर
Sumit: Work done, w1 = 600 J
Time taken, t1 = 10 min = 600 sec
Power, p1 = `w_1/t_1`
= `600/600`
= 1 W
Amit: Work done, w2 = 300 J
Time taken, t2 = 20 min = 1200 sec
Power, p2 = `w_2/t_2`
= `300/1200`
= `1/4`
= 0.25 W
∴ Ratio of Powers = `p_1/p_2`
= `1/(1/4)`
= 4 : 1
APPEARS IN
संबंधित प्रश्न
All electrical appliances in a household circuit work at the same voltage.
In a household electrical circuit, the appliance are connected in ............with the mains.
The purpose of an electric meter in a house is
What is an electric meter? Where is it fixed in our house?
The diagram below in figure shows the reading on the dials of a meter. State what is its reading.
If an appliance of power P watt is used for time t hour. How much electrical energy is consumed in kWh?
Figure shows two ways of connecting the three bulbs A, B and C to a battery. Name the two arrangements. Which of them do you prefer to use in a household circuit? Give a reason to support your answer.
An electric iron of power 1.5 kW is used for 30 minutes to press the clothes. Calculate the electrical energy consumed in
- kilowatt-hour
- joule.
In a premise 5 bulbs each of 100 W, 2 fans each of 60 W, 2 A.Cs each of 1.5 kW is used for 5 h per day. Find:
- Total power consumed per day,
- Total power consumed in 30 days,
- Total electrical energy consumed in 30 days.
- The cost of electricity at the rate of ₹ 6.25 per unit.
What is the voltage of the electricity that is generally supplied to a house?
