Advertisements
Advertisements
प्रश्न
How does the heat produced by die passage of current in a metallic wire depend on the current in the wire?
Advertisements
उत्तर
The heat produced is proportional to the square of current passed in the wire.
संबंधित प्रश्न
At what frequency is AC supplied to residential houses?
What is consumed using different electrical appliances, for which electricity bills are paid?
The SI unit of energy is :
(a) joule
(b) coulomb
(c) watt
(d) ohm-metre
Two bulbs are rated 60 W, 220 V and 60 W, 110 V respectively. Calculate the ratio of their
resistances
Define electric power. An electrical device of resistance R is connected across a source of voltage V and draws a current I. Derive an expression for power in terms of current and resistance.
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.
An electrical appliance is rated 1500 W, 250 V. This appliance is connected to 250 V mains. Calculate:
(i) the current drawn,
(ii) the electrical energy consumed in 60 hours,
(iii) the cost of electrical energy consumed at Rs. 2.50 per kWh.
Find the cost of operating an electric toaster for two hours if it draws 8 A current on a 110 volt circuit. The cost of electrical energy is Rs. 2.50 per kWh.
Unit of electric power may also be expressed as:
