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An electric bulb is rated 220V and 100W. when it is operated on 110V, what will be the power consumed?

P = V 2/R
If V = 220 V we have

100 W = 220 2/R
R = 220 2/100 Ω = 484 Ω. This is the resistance of the bulb.

When V = 110 V,...

Jun 24

• 6 Likes
• 113156 Views

Jun 24

Syeda answered 1 year(s) , 11 month(s) ago

What is the difference between resistance and resistivity of a conducter? Please Explain?

May 7

• 4 Likes
• 67371 Views

May 7

Priyanshu answered 1 year(s) , 11 month(s) ago

I want all the formulas used in chapter electricity

The formulas used in class X are-
1- I,current=Q,charge/T,time
2- V,potential differnce=W,work done/Q,charge
3-V,potential difference=I,current*R,resistance
4-Resisitivity=(R,res...

Jul 9

• 4 Likes
• 60609 Views

Jul 9

Amarnathreddy answered 4 year(s) , 10 month(s) ago

Calculate the number of electron constituting 1 coulomb of charge

Answer: The charge on an electron is negative and it is -1.6⨯10 -19 coulomb therefore, 1 C charge is carried by 1/ (-1.6⨯10 -19) = 6.25 ⨯ 10 18 electrons. He...

Jul 22

• 4 Likes
• 49422 Views

Jul 22

Syeda answered 1 year(s) , 11 month(s) ago

State Joules law of heating. Mention SI unit Heat energy.

SI Unit of Heat Energy is Joule(J)

Apr 22

• 5 Likes
• 43638 Views

Apr 22

what are the factors on which the resistance of a conductor depends? what happens to the resistivity of a conductor when its length is doubled?

Resistance of a conductor directly depends upon Length of the wire L
Inversely depends upon Area of Cross section of the conductor 1/A
Nature of material used.
Therefore, R

...

Jul 20

• 4 Likes
• 40790 Views

Jul 20

8. What is the resistance of an ideal voltmeter and ammeter ? how are they connected in a circuit?

The internal resistance of an ideal voltmeter is infinity and the internal resistance of an ideal ammeter is zero.
Ammeter is connected in series and voltmeter is connec...

Jun 6

• 2 Likes
• 34159 Views

Jun 6

Sharathchandar answered 3 year(s) , 10 month(s) ago

Why an ammeter is connected in series while a voltmeter is in parallel?

(i) The internal resistance of the ammeter is very low.If we connect it in series, then
the maximum current can flow through it. So the accurate current should be
measured. I...

Jul 11

• 1 Like
• 31037 Views

Jul 11

Amarnathreddy answered 5 year(s) , 10 month(s) ago

draw a schematic diagram of circuit consisting of a battery of five 2 V cells, a 5 ohm resistor, a 10 ohm resistor and a 15 ohm resistor , and a plug key, all are connected in series.Calculate the ele

Solution:

As per the data provided in the sum three resistors of 5Ω,10Ω and 15Ω are connected in series so the net resistance = 5Ω +10Ω+15Ω = 3...

Aug 3

• 3 Likes
• 28764 Views

Aug 3

Agam answered 1 year(s) , 7 month(s) ago

a 100 electric bulb is lighted for 2 hrs daily and four 40w bulbs are lighted for 4 hrs daily .calculate the energy consumed(in Kwh)in 30 days

Energy consumed by electric bulb = power of the bulb ⨯ Time

Energy consumed by electric bulb of 100 w = 100 w ⨯ 30 ⨯ 2 hrs

Energy consumed by electric bulb of...

Jun 11

• 3 Likes
• 27156 Views

Jun 11

Navneet answered 2 year(s) , 1 month(s) ago

Series arrangement are not used for domestic cicuit. List any 3 reasons

Series arrangement is not used for domestic circuits due to following reasons :

(1) In series arrangement same current will flow through all the appliances, which is n...

Jun 15

• 5 Likes
• 25251 Views

Jun 15

On which factors does resistivity depend?

lenght and breadth of the electric conductor.

May 2

• 0 Like
• 24327 Views

May 2

Amarnathreddy answered 5 year(s) , 9 month(s) ago

Difference between resistance and resistor ?

Resistor Resistance A resistor is an electric  component with a predetermined electrical resistance, like 1 ohm, 10 ohms 100 ohms 10000 ohms etc....

Sep 16

• 2 Likes
• 21635 Views

Sep 16

Syeda answered 1 year(s) , 11 month(s) ago

What are the advantages of connecting Electric devices in parallel with the battery instead of connecting them in series

What are the advantages of connecting Electric devices in parallel with the battery instead of connecting them in series?

Apr 28

• 1 Like
• 21324 Views

Apr 28

Vishesh answered 4 year(s) , 2 month(s) ago

What is potential difference and electric potential?

Electric potential

An electric potential is defined as the amount of electric potential energy that a unitary point electric charge would have if located at any point of space....

Apr 3

• 3 Likes
• 21298 Views

Apr 3

Syeda answered 1 year(s) , 11 month(s) ago

A wire of resistance 5 ohm is drawn out so that its length is increased to twice its original length. Calculate its new resistance

According to the laws of electric resistance, resistance is inversely proportional to   the cross – sectional area of the conductor we can say that resistivity is same for both the wires...

Jun 7

• 1 Like
• 21156 Views

Jun 7

Amarnathreddy answered 3 year(s) , 11 month(s) ago

A wire of length L and R is stretched so that its length is doubled and the area of cross section is halved. How will its (i) Resistance change (ii) Resistivity change.

Data:

Let new length = l'
new Area =, A' and
new resistance = R'

Given, l' = 2l and A' = A/2

As we know

R = (ρl) /
...

Jul 2

• 1 Like
• 20963 Views

Jul 2

Syeda answered 2 year(s) , 1 month(s) ago

10 devices which uses heating effect of electric current

electric bulb,electric kettle,electric oven,electric toaster,electric fuse,electric heater,electric laundry iron and geyser

May 27

• 0 Like
• 20612 Views

May 27

Janhavi answered 4 year(s) , 1 month(s) ago

An electric motor takes 5 A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h.

given I = 5A
V = 220V
∴ power = V*I
= 5*220
= 1100 W
= 1.1kW
Energy consumed = Power*Time
...

Apr 29

• 1 Like
• 20448 Views

Apr 29

Syeda answered 1 year(s) , 11 month(s) ago

(a) Electric fuse is an important component of all domestic circuits. Why? (b) An electric oven of rating 2kW,220V is operated in a domestic circuit with a current rating of 5A. what result wou

An electric fuse is a safety device used to limit the current in an electric circuit. The use of a fuse is to safeguard the electric circuit and the electric appliances connected in the...

Jun 24

• 1 Like
• 18636 Views

Jun 24

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