Question

as we know that battery or a cell is the source of electrical energy. The chemical reaction within the cell generates the
ential difference between its two terminals that sets the electrons in motion to flow the current through a resistor or 2
sister of resistors donnected to the battery. We also know that to maintain the currents the source has to keep expendings
energy Where does this energy gp? A part of the source energy in maintaining the current may be consumed into useful work
(ske in rolating the blades of an electric fan). Rest of the spurce may be expended heat to raise the temperatureségadget-
We often observe this in our everyday life. For example, an electric fan becomes warm if used continuously for longer time
etc On the other hanix, if the electronic circuit is purely resistive, that is configuration of resistors only connected to a
battery, the source energy continually gets dissipated entirely in the form of heat. This is known as the heating effect of the
electric current. This effect is utilised in devices such as eléctric heater, electric iron, etc.
a) How is a current established through a resistor when it is joined to an electric cell?
b) Why does an electric fan become warm if used for some time continuously?
c) What is the amount of heat produced when current flows through a resistor R for timet
d) Graph plotted between heat produced (H) and time (t) for resistors A and B joined in series in an electric circuit are shown
here. Which has smaller resistance between A and B and why?
B
H​

Answer 1

Answer:

as we know that battery or a cell is the source of electrical energy. The chemical reaction within the cell generates the

ential difference between its two terminals that sets the electrons in motion to flow the current through a resistor or 2

sister of resistors donnected to the battery. We also know that to maintain the currents the source has to keep expendings

energy Where does this energy gp? A part of the source energy in maintaining the current may be consumed into useful work

(ske in rolating the blades of an electric fan). Rest of the spurce may be expended heat to raise the temperatureségadget-

We often observe this in our everyday life. For example, an electric fan becomes warm if used continuously for longer time

etc On the other hanix, if the electronic circuit is purely resistive, that is configuration of resistors only connected to a

battery, the source energy continually gets dissipated entirely in the form of heat. This is known as the heating effect of the

electric current. This effect is utilised in devices such as eléctric heater, electric iron, etc.

a) How is a current established through a resistor when it is joined to an electric cell?

b) Why does an electric fan become warm if used for some time continuously?

c) What is the amount of heat produced when current flows through a resistor R for timet

d) Graph plotted between heat produced (H) and time (t) for resistors A and B joined in series in an electric circuit are shown

here. Which has smaller resistance between A and B and why?

B

H

Answer 2

f120 द एक्सप्लेन द ज्वेलरी ब्लॉक इट इज द सिस्टम ऑफ द फॉलोइंग ऑफ द कंट्री फॉर ए लोंग टाइम एंड इलेक्ट्रिकल कॉरपोरेशन