Answer: Watt\n\n\n\nExplanation:\n\nThe SI unit of power is Watt, symbolized by the letter 'W'. This unit was named after James Watt, a Scottish inventor and mechanical engineer who made significant improvements to the steam engine during the Industrial Revolution. The watt was officially adopted as the SI unit of power in 1960.\n\nPower is defined as the rate at which work is done or energy is transferred. In mathematical terms, power equals work done divided by time taken, or P = W\/t. One watt is equal to one joule of energy transferred per second, which can be expressed as 1 W = 1 J\/s.\n\nTo understand this better, let's look at some everyday examples:\n\n• A typical LED bulb consumes about 10-15 watts of power\n• A smartphone charger uses approximately 5-10 watts\n• A microwave oven operates at around 700-1000 watts\n• A hair dryer typically uses 1000-1800 watts\n\nFor larger power measurements, we use multiples of watts. Kilowatt (kW) equals 1,000 watts and is commonly used to measure the power consumption of household appliances and small motors. Megawatt (MW) equals 1,000,000 watts and is used for measuring the power output of large engines and power plants.\n\nIn electrical circuits, power can also be calculated using the relationship P = VI, where V is voltage in volts and I is current in amperes. This formula is particularly useful when dealing with electrical appliances and circuits.\n\nUnderstanding watts is crucial for energy efficiency and cost calculations. When you see a \"60W\" on a light bulb or \"1500W\" on a heater, it tells you how much electrical power that device consumes per second of operation.

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Grade 10

SI unit of Power?

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Answer: Watt

Explanation:

The SI unit of power is Watt, symbolized by the letter 'W'. This unit was named after James Watt, a Scottish inventor and mechanical engineer who made significant improvements to the steam engine during the Industrial Revolution. The watt was officially adopted as the SI unit of power in 1960.

Power is defined as the rate at which work is done or energy is transferred. In mathematical terms, power equals work done divided by time taken, or P = W/t. One watt is equal to one joule of energy transferred per second, which can be expressed as 1 W = 1 J/s.

To understand this better, let's look at some everyday examples:

• A typical LED bulb consumes about 10-15 watts of power • A smartphone charger uses approximately 5-10 watts • A microwave oven operates at around 700-1000 watts • A hair dryer typically uses 1000-1800 watts

For larger power measurements, we use multiples of watts. Kilowatt (kW) equals 1,000 watts and is commonly used to measure the power consumption of household appliances and small motors. Megawatt (MW) equals 1,000,000 watts and is used for measuring the power output of large engines and power plants.

In electrical circuits, power can also be calculated using the relationship P = VI, where V is voltage in volts and I is current in amperes. This formula is particularly useful when dealing with electrical appliances and circuits.

Understanding watts is crucial for energy efficiency and cost calculations. When you see a "60W" on a light bulb or "1500W" on a heater, it tells you how much electrical power that device consumes per second of operation.