Question

A 1.5 V carbon – zinc dry cell is connected across a load of 1000 Ω. Calculate the current and power supplied to it.

Answer 1

Given conditions ⇒

Potential(V) = 1.5 V.
Resistance(R) = 1000 Ω

Using the Ohm's law,

V = I × R
∴ I = V/R
⇒ I = 1.5/1000
⇒ I = 1.5 × 10⁻³ A.

Hence, the Current is 1.5 × 10⁻³ A.

Now, Using the Formula,

P = V × I
∴ P = 1.5 × 1.5 × 10⁻³
⇒ P = 2.25 × 10⁻³

Hence, the Power supplied to it is 2.25 × 10⁻³ W.


Hope it helps.