A25 watts
B40 watts
C60 watts
DNone of the above
Answer:
C. 60 watts
Read Explanation:
The power consumed by an electrical appliance like a bulb is related to the voltage across it and the current flowing through it. The fundamental formula is P = V * I, where P is power, V is voltage, and I is current.
Using Ohm's Law (V = I * R), we can derive other useful relationships.
When voltage (V) is constant (as is typically the case for household bulbs connected to the same mains supply), the power dissipated by a resistor is given by: P = V^2 / R.
Rearranging this formula to find resistance, we get: R = V^2 / P.
We are given three bulbs with power ratings of 25 W, 40 W, and 60 W.
Since all bulbs are assumed to be connected to the same voltage source (e.g., household electricity), the voltage (V) is constant for all of them.
From the formula R = V^2 / P, we can see that resistance (R) is inversely proportional to power (P) when voltage is constant. This means that a higher power rating will correspond to a lower resistance.