Solved: Lightbulb A is rated at 120 V and 40 W for

Chapter 16, Problem 79GP

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QUESTION:

Lightbulb A is rated at 120 V and 40 W for household applications. Lightbulb B is rated at 12 V and 40 W for automotive applications, (a) What is the current through each bulb? (b) What is the resistance of each bulb? (c) In one hour, how much charge passes through each bulb? (d) In one hour, how much energy does each bulb use? (e) Which bulb requires larger diameter wires to connect its power source and the bulb?

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QUESTION:

Lightbulb A is rated at 120 V and 40 W for household applications. Lightbulb B is rated at 12 V and 40 W for automotive applications, (a) What is the current through each bulb? (b) What is the resistance of each bulb? (c) In one hour, how much charge passes through each bulb? (d) In one hour, how much energy does each bulb use? (e) Which bulb requires larger diameter wires to connect its power source and the bulb?

ANSWER:

Step-by-step solution

Step 1 of 9

  1. The voltage rating is for A:

The power rating is:

The voltage rating for B is:

The current through bulb A is:

           The current is 0.33 A.

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