Question

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Answer 1

Given data:

Potential difference, V = 200 V

Resistance, R = 400 ohm

Time, t = 2 minutes

Answer:

• Electric current = 0.5 A
• Electric heat = 12,000 Joule

Explanation:

If this resistance is of electric iron, then the current flowing through it i calculated using the ohm's law in the following manner :-

V = IR

I = V / R

= 200V / 400 omega

= 0.5A

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

Now, if current flows for 2 minutes in the electric iron , then the electric heat generated is =

= H = I²Rt

= (0.5A)²(400 Omega )(2 × 60 s)

= 12,000 Joule

Electric current = 0.5A

Electric heat = 12,000 Joule

Note :- here, in my keyboard, I don't have Omega symbol, so instead using of it, I've used written omega, please write omega symbol, instead of writing omega !!!

Answer 2

》satyam

(i) Calculation of Current. The current can be calculated by using Ohm's law equation:

VI=RVI=R

Here, Potential difference, V=250V=250 volts

Current, I=1?I=1? (To be calculated)

Resistance, R=500R=500 ohms

Putting these values in the above formula, we get:

250I=500250I=500

So, I=250500I=250500

=12=12

= 0.5 ampere

Thus, the current flowing in the electric iron in 0.5A.

(ii) Calculation of Heat Energy. The heat energy in joules can be calculated by using the formula:

H=I2×R×tH=I2×R×t

Here, Current, I=0.5AI=0.5A

Resistance, R=500ΩR=500Ω

And, Time, t=10st=10s

Putting these values in the above formula, we get:

H=(0.5)2×500×10

= 1250 joules