## Heating Effect of Electric current:

When an electric current is passed through a conductor gets heated this phenomenon is known as the

**Heating Effect of Electric current.**
Cause- Collides of electron and conductor atom.

#### JOULE,S LAW OF HEATING EFFECTS:

The law which is given by joule scientist relation between heat and current is called Joule's law of heating effects.

**1st law:-**According to this law heat produced by the conductor is directly proportional to the square of current when resistance and time are constant.

i.e. H ∝ I

^{2}( R and t is constant ) --- (i)**2nd law:-**According to this law heat produced by the conductor is directly proportional to resistance when current and time is constant.

i.e. H ∝ R ( I and t is constant ) --- (ii)

**3rd law:-**According to this law heat produces by the conductor is directly proportional to time when current and resistance is constant.

i.e. H ∝ t ( I and R is constant ) --- (iii)

from equation (i), (ii) and (iii)

**H ∝ I**

^{2}Rt
H = K.I

^{2}Rt when K=1**H = I**

^{2}Rt
H = IR x It

H = VIt

in the form of potential difference

H = IR x It

H = VQ [Q=It]

in the form of charge and potential difference

**Heating Element:**Those type of appliance which heats up due to the heating effect of electric current is called the heating element.

example:- Nichrome, Tungeston.

↪ It is made of materials of high resistance.

Also Read:

• Force on a Dielectric in a Capacitor.

• What is Coulomb’s Law and some related important point.

• Write the properties of Conductor.

• What is charge and also described properties of charge.

• What is Coulomb’s Law and some related important point.

• Write the properties of Conductor.

• What is charge and also described properties of charge.

**Electric Energy:**The total work done by the current in an electric circuit is called electric energy.

↪ It is represented by 'E' .

↪ Its S.I unit is Joule.

↪ Its S.I unit is Joule.

↪ Its commercial unit is kilowatt-hour (Kwh).

↪ Its dimension is [ML

^{2}T^{ -2}]
Suppose an Electric circuit in which 'I' current flow for time 't' during this time is charge 'Q' flows then,

**Q=It**

If the potential difference between resistance is 'V' for the main flow of charge then,

V = W/Q

VQ = W

W = Q x V

W = It x V

**W = It.V = E**

W = It x IR

W = E = I

^{2}Rt**W = I**

^{2}Rt
Electric energy = Electric power x time

**E = P.t****Electric Power:**The amount of electric energy consumed in a circuit per unit time is called electric power.

- It is denoted by ‘P’.
- It is a scalar quantity.
- Its dimension is [ ML
^{2}T^{ -3}] - Its S.I unit is
*Watt*(W) or*J/sec.*

P = W/t = E/t = VI

P = W/t

P =I

^{2}Rt /t**P =** I

^{2}R
P = IR x I

*P = VI*
P = I

^{2}R
P = V

^{2}/R^{2}x R**P =V**

^{2}/R**One watt:**If the one-joule work is done in one second by electricity then, the power of electricity is called one watt.

↪Its dimension is [ ML

^{2}T^{ -3}]
Note:- Power has also unit Kilowatt, Megawatt, Gigawatt.

#### Some Largest Unit of Power:

1 Kilowatt = 10

^{3 }Watt
1 Megawatt = 10

^{6 }Watt
1 Gigawatt = 10

^{9}Watt**1 Wh = 3600 J**

Particle and experiment unit of power is horse-power (H.P)

**1 H.P = 746 Watt**

**Commercial Unit of the Electrical Energy:**The unit used to measure the electric energy in any traditional center is called the Commercial Unit of Electrical Energy.

- It is also known as Board of trade unit (B.O.T)
- In this unit energy measured in Kilowatt hour (kW-h)

**1 unit = 1 kWh = 3.6 x 10**

^{6}J

**One kilowatt-hour:**The amount of electrical energy consumed by 1000 watt electrical appliance when it operates for one hour is called One kilowatt-hour.

One kilowatt is also known as “One unit”.

**Relation between kilowatt-hour and Joule**

1 Kwh = 1000 watt x h

1 kwh = 1000 J/sec x h

1 Kwh = 1000 j/sec x 3600 sec

**1 Kwh = 3.6 x 10**

^{6}J

**Power Rating of an Appliance:**let, take a bulb if the bulb is lighted on a 220 V supply. It consumed 100 W electric power that means 100 J of electric energy is converted in the filament of the bulb into heat energy and light energy in one second.

**Efficiency of an Electric device:**The ratio of output power to the input power is called the efficiency of an electric device.

It is represented by ‘Î·’

Î· = output power/input power

### Some Essential Components of the house wiring system

**Electric Fuse:**An electric fuse is a safety device that is used to limit the current in an electric circuit.

• It is a short length thin wire made of a tin-lead alloy having a low melting point.

• It is always connected in series in the wire of the circuit.

• It is provide overloading.

**Switches:**A switch is an on-off device for current in a circuit that is connected in the live wire.

**Earthing (Grounding):**Earthing is an appliance which means connecting the metal body buried deep in the earth through the earth-wire.

• It is used for safety measures.

**Current Rating of Fuse:**The maximum current that can flow through a fuse-wire is called the power or current rating of a fuse.

The power of a fuse is 10 A, this means that the maximum the current of 10 A can flow through the fuse-wire.

**Short Circuit:**When the live wire comes in direct contact with the neutral wire then heavy current passes through the appliance this is called short circuit.

**Overloading:**Overloading of the electric circuit means that the current circulating in the circuit becomes more than the capacity of components in the circuit to withstand the current.

Thank you

**All the Best !!**

Team

**Fast2study**
## 0 Comments

Please do not enter any Spam link in the comment Box