Question

A.P.D of 250V is applied across a resistance of 500ohm an electric iron calculate 1.current and 2.heat energy in joules in 10 seconds? (0.5 A/1250J)​

Answer 1

Answer:

1. 0.5 ampere

2. 1250 joules

Explanation:

1. To calculate current use ohm's law

   I = V/R   ....... I = 250/500    = 0.5 A

2. To calculate heat use the formula  H = I²Rt

       H = (0.5)²(500)(10)   = 1250 joules

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Answer 2

➝ (i) Calculation for current:-

↬ Given :-

• potential difference (v) = 250 v

• Resistance (R) = 500 Ω

↬ To Find :-

• Current (I) = ?

↬ Solution :-

$\underbrace{\bf\:By\:using\:Ohm's\:law}$

⸕ we know that,

$\purple{\bigstar}\:\:{\underline{\boxed{\bf\red{\dfrac{v}{I}=R}}}}$

$\rm\longrightarrow\:\dfrac{250}{I}=500$

$\rm\longrightarrow\:I=\cancel\dfrac{250}{500}$

$\rm\longrightarrow\:I=\dfrac{1}{2}$

$\rm\longrightarrow\:I=0.5\:ampere$

Hence,the current flowing in the electric iron will be 0.5 ampere.

➝ (i) Calculation for Heat energy :-

↬ Given :-

• Current (I) = 0.5 ampere

• Resistance (R) = 500 Ω

• Time (t) = 10 sec

↬ To Find :-

• Heat energy (H) = ?

↬ Solution :-

We know that,

$\orange{\bigstar}\:\:{\underline{\boxed{\bf\pink{H={I}^{2}\times\:R\times\:t}}}}$

$\rm\longrightarrow\:H={(0.5)}^{2}\times\:500\times\:10$

$\rm\longrightarrow\:H=0.25\times\:500\times\:10$

$\rm\longrightarrow\:H=1250\:joules$

Hence,the heat energy produced in 10 sec will be 1250 joules.