WAEC SSCE - Physics - 1990 (Objective)

Calculate the resistance of the filament of a lamp rates 240 V, 40 W

240Ω

360Ω

720Ω

1440Ω Azịza ziri ezi

2880Ω

Akọwa Nkọwa

The power (P) of the lamp is given as 40 W and the voltage (V) is given as 240 V. Using Ohm's Law, we can calculate the resistance (R) of the filament of the lamp. Ohm's Law states that V = IR, where V is the voltage, I is the current, and R is the resistance. Using the formula for power, we know that P = IV. Substituting Ohm's Law into this equation gives P = (V²/R). Rearranging this formula gives R = V²/P. Substituting the given values gives R = (240²/40) = 1440 Ω. Therefore, the resistance of the filament of the lamp is 1440 Ω. Answer: 1440Ω






Pịa ma Jide iji Dọkpụrụ Ya
Pịa Ebe a ka Imechi