1. Define electric power. State its SI unit. 2. What is the formula for electric power? Derive its relation with voltage, current and resistance using Ohm's law. 3. Define 1 watt power. 4. What is the commercial unit of electric energy consumed? 5. Write some applications of heating effect of electric current. 6. Explain function of electric fuse in a circuit.?

Question

Answer

1)Electric power is the rate, per unit time, at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second.

2)

3)1 watt is the power of an appliances which consumes energy at the rate of 1 joule per second.

4)Kilowatt - hour is the commercial unit of electrical energy.

5)The heating effect of electric current is used in the following applications: ... Electric iron: The element of electric iron is made of alloys having high melting point. Electric heater and geyser work on the same mechanism. Electric fuse: Electric fuse is used to protect the electric appliances from high voltage; if any.

6)The main function of the fuse is to provide overcurrent protection, of either the load or source circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, interrupting the circuit that it connects. ... Fuses can be used as alternatives to circuit breakers.

Answer

Electric Power

Electric power is the rate at which electric energy is transferred or converted into another form of energy in a circuit. The SI unit of electric power is watt (W).

Formula for Electric Power

The formula for electric power is P = VI, where P is power, V is voltage, and I is current. Using Ohm's law, we can also derive the formula for electric power as P = I^2R = V^2/R, where R is resistance.

1 Watt Power

1 watt power is the amount of power required to do work at a rate of 1 joule per second.

Commercial Unit of Electric Energy Consumed

The commercial unit of electric energy consumed is kilowatt-hour (kWh).

Applications of Heating Effect of Electric Current

Some applications of the heating effect of electric current include:

- Electric heaters
- Electric stoves
- Electric irons
- Incandescent light bulbs
- Electric soldering irons

Function of Electric Fuse in a Circuit

An electric fuse is a safety device that is used to protect an electrical circuit from overloading or short-circuiting. When a current that is higher than the rated value flows through the circuit, the fuse wire melts and breaks the circuit, preventing any further damage. This helps to prevent fires and other hazards that can occur due to electrical faults.

Answer

Electric power is defined as the amount of electric energy consumed in a circuit per unit time. Its SI unit is 'Watt'. Electric power is said to be 1 watt if 1 ampere flows through a circuit having 1 volt potential difference.

The formulas of power are: P=VI, P=I2R( I square R), P=Vsquare/R.
Electric power is said to be 1 watt if 1 ampere current flows through a circuit having 1 volt potential difference.
The commercial unit of electric energy consumed is ' Kilowatt hour'.A kilowatt hour is the amount of electric energy consumed by 1000watt electric appliances when it is operated for 1 hour.

Some applications of heating effect of electric current are:
1.Electric bulb glows when electric current flows through the filament of the bulb.
2.Electric fuse in the electric circuit melts when large current flows in the circuit.
3.Electric appliances works on the heating effect of current.

The function of electric fuse in a circuit are:
It is the most important safety device used for protection of electrical circuits. The Fuse is a piece of wire made of a material with a low melting point.When there is overloading or short circuiting, the fuse wire gets heated and melts thus, disconnecting the circuit from the main supply line.Thus, it saved the electrical appliances from damaging as well as from causing destruction. The thickness and length of a fuse wire depends on the maximum current permitted through the circuit. The fuse must be connected to the live wire.

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