Advertisements
Advertisements
Question
If the potential differences between two parts of a thundercloud is 10s V,
what is the amount of energy given up during the passage of 20 coulombs?
(a)2x10-7J
(b)200J
(c)Sx106 j
(d)2x 109J
(e)2x 1010 J
Solution
Given, p.d. , V = 108 volt, charge Q = 20 coulombs
Energy given= QV = 20 x108 =2x109 J
(d) 2x109 J
APPEARS IN
RELATED QUESTIONS
Complete the following sentence:
A fuse is connected in ........... with the ......... wire.
Find the effective resistance in the following circuit diagrams (Fig.):
Fig. shows a 3 pin plug with the cover removed. The electric cable
connected to the plug contains 3 wires with colour coded insulation namely brown, blue and green.
- Identify each of the colour coded wires by stating to which of the
terminals A, B or C in the diagram they should be connected. - Identify the terminal through which no current passes in normal
circumstances. - What is the purpose of the earthed wire connected to an electric
appliance like an electric heater? Describe how it works.
An electric iron is rated 750 W, 230 V. Calculate the electrical energy consumed by the press in 16 hours.
A bulb marked 12 V, 24 W operates on a 12 V battery for 20 minutes. Calculate:
- The current flowing through it, and
- The energy consumed.
A current of 0.2 A flows through a wire whose ends are at a potential difference of 15 V. Calculate:
(i) The resistance of the wire, and
(ii) The heat energy produced in 1 minute.
The SI unit for electric current is the coulomb.
