Question

400 J of heat is produced in 4s in a 4 ohm resistor. Find the potential difference across the resistor​

Answer 1

Given:-

• Powe (P) = 400J

• Time taken (t) =4s

• Resistance (R) = 4 ohm

To Find:-

• Potential difference across the resistor(v).

Solution:-

By using this formula

→ P = V²/R×t

Substitute the value , we get

→ 400 = v²/4×4

→ 400 = v²

→ v =√400

→ v = 20volt.

∴ The Potential difference across the resistor is 20 volts.

Answer 2

✔ Given ✔

• Power = 400 Joules.

• Time = 4 seconds.

• Resistance = 4 ohm.

✔ To Find ✔

• Potential Difference across the resistor.

✔ Solution ✔

We know that,

Potential Difference is Given by :-

P = V²/r × t.

Here,

P = Power,

V = Potential Difference,

r = Resistance,

t = time.

Now, Put the values given.

↣ 400 = V²/4 × 4.

↣ 400 = V²

↣ V² = 400

↣ V = √400.

↣ V = 20.

⚜ Hence, Potential Difference Across the Resistor = 20 Volts. ⚜