In a circuit with fixed voltage, increasing a lamp's resistance will cause its wattage to

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Study for the DC Theory Exam. Utilize flashcards and multiple choice questions; each question comes with explanations. Get ready for your test!

Multiple Choice

In a circuit with fixed voltage, increasing a lamp's resistance will cause its wattage to

Explanation:
With a fixed supply voltage, the lamp’s wattage is determined by P = V^2 / R. If you increase the lamp’s resistance, the current it draws drops (I = V / R). Since power equals voltage times current, a smaller current means less power is dissipated. So the wattage decreases. It won’t stay the same or oscillate under a steady DC supply.

With a fixed supply voltage, the lamp’s wattage is determined by P = V^2 / R. If you increase the lamp’s resistance, the current it draws drops (I = V / R). Since power equals voltage times current, a smaller current means less power is dissipated. So the wattage decreases. It won’t stay the same or oscillate under a steady DC supply.

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