Advertisements
Advertisements
प्रश्न
Two bulbs are rated 60 W, 220 V and 60 W, 110 V respectively. Calculate the ratio of their resistances.
Advertisements
उत्तर
Given,
Voltage, V1 = 220 V
V2 = 110 V
Power, P1 = P2 = P = 60 W
As R = `"V"^2/"P"`
`"R"_1 = "V"_1^2/"P" = (220 xx 220)/60`
`"R"_2 = "V"_2^2/"P" = (110 xx 110)/60`
On dividing R1 and R2
`"R"_1/"R"_2 = ((220 xx 220)/60)/((110 xx 110)/60)`
= `4/1`
`"R"_1 : "R"_2 = 4 : 1`
APPEARS IN
संबंधित प्रश्न
S.I. unit and commercial unit of electrical energy are same.
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.
One kilowatt hour is equal to ............ joule.
What is an electric meter? Where is it fixed in our house?
If an appliance of power P watt is used for time t hour. How much electrical energy is consumed in kWh?
Draw a labelled diagram with the necessary switches to connect a bulb, a fan and a plug socket in a room with the mains. In what arrangement will you connect them to the mains?
Assuming the electric consumption per day to be 12 kWh and the rate of electricity to be? 6.25 per unit, find how much money is to be paid in a month of 30 days?
State and define the household unit of electricity.
Our body can pass electricity through it.
