Question bank: Electricity: Electric Power

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Question 1:

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Electricity: Electric Power

Question 2:

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Electricity: Electric Power

Question 3:

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Electricity: Electric Power

Question 4:

Medium

An electric shower of 220V and 4000W is used in a 10-minute shower. What is the amount of electrical energy consumed in this period of time?

Electricity: Electric Power

Question 5:

Hard

An electric immersion heater, with a resistance of 20 ohms, is used to heat 4 liters of water initially at 20 degrees Celsius to the boiling point, at a constant power of 1500 W. Considering that the specific heat of water is 4.18 J/(g·°C) and that water has a density of 1 g/ml, determine: 1) The time required, in seconds, for the water to reach the boiling temperature. 2) The total amount of energy, in joules, supplied by the resistance during the water heating process. Explain the calculation process of power and supplied energy, considering the relationships between power, energy, electrical resistance, and temperature variation.

Electricity: Electric Power

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