Question

A potential difference of 250 volts is applied across a resistance of 500 ohms in an electric iron.calculate current and heat energy produced in joules in 10 seconds.​

Answer 1

Given :

Potential difference = 250 volts

Resistance = 500 ohms

Time = 10 sec.

To find :

The current and heat energy produced.

Solution:

we can find current using ohm's law that is,

» At constant temperature the current flowing through a conductor is directly proportional to the potential difference across its ends.

V = RI

where,

• V denotes potential difference
• R denotes resistance
• I denotes current

substituting all the given values in the formula,

$\leadsto \sf V = RI$

$\leadsto \sf 250 = (500)(I)$

$\leadsto \sf I = \dfrac{250}{500}$

$\leadsto \sf I = 0.5 \:A$

thus, the current flowing in the electric iron is 0.5 A.

we can find heat energy produced by Using joules law of heating that is,

» The heat produced in a wire is directly proportional to

• square of current (I²)
• resistance of wire (R)
• time (t) for which current is passed.

In order words,

H = I²Rt

where,

• H denotes Heat produced.
• I denotes current.
• R denotes resistance.
• t denotes time.

substituting all the given values in the equation,

$\leadsto \sf H = l^2 \times R \times t$

$\leadsto \sf H = (0.5)^2 \times 500 \times 10$

$\leadsto \sf H = 0.25 \times 500 \times 10$

$\leadsto \sf H =1250 \: J$

thus, the heat energy produced by the electric iron is 1250J.

Remember !

• SI unit of resistance is ohms (Ω).
• SI unit of current is ampere (A).
• SI unit of heat is Joules (J).

Answer 2

Answer:

1250 joules heat produced..

Explanation:

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