David wants to experiment with the device, so he connects an ammeter into the circuit and measures 11.5 AA when the device is connected to the car's battery. From this, he calculates the time to boil a cup of water using the device. If the energy required is 100 kJkJ, how long does it take to boil a cup of water?

Question

Aaron Mckee

Physics

10 December, 15:13

David wants to experiment with the device, so he connects an ammeter into the circuit and measures 11.5 AA when the device is connected to the car's battery. From this, he calculates the time to boil a cup of water using the device. If the energy required is 100 kJkJ, how long does it take to boil a cup of water?

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Answers (1)

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Ciara Cardenas · Answer 1

2.42hours

Explanation:

To calculate the time taken to boil the cup of water, we will use the formula

Q = It where

Q is the total energy required to boil the water = 100KJ = 100,000Joules

I is the current = 11.5A

t is the time taken to boil the water

t = Q/I

t = 100,000/11.5

t = 8695.65seconds

t = 2.42hours