Advertisements
Advertisements
प्रश्न
Three 250 W heaters are connected in parallel to a 100 V supply, Calculate the resistance of each heater.
Advertisements
उत्तर

The resistance of each heater
Since P = `"V"^2/"R"`
or I = `"V"^2/"R" = (100 xx 100)/250 = 40 Omega`
Therefore, 40 Ω is the resistance of each heater.
संबंधित प्रश्न
Define watt. Write down an equation linking watts, volts and amperes.
1Kwh =`( 1 "volt "xx 1 am pere xx.............)/1000`
An electric toaster draws 8 A current in a 220 V circuit. It is used for 2 h. Find the cost of
operating the toaster if the cost of electrical energy is Rs. 4.50 per kWh.
An electric bulb, when connected across a power supply of 220 V, consumes a power of 60 W. If the supply drops to 180 V, what will be the power consumed? If the supply is suddenly increased to 240 V, what will be the power consumed?
What is the current in the circuit shown (Fig. )

An electric bulb of resistance 500 Ω draws current 0.4 A from the source. Calculate:
- the power of bulb and
- the potential difference at its end.
What is electric power? State and define its S.I. unit.
Household wiring for lamp connections can either be done in parallel or in series.Which one would you prefer? Give a reason for your answer.
How does earthing prevent electrical shock?
What is the resistance of an appliance rated at V volt, P watt?
