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What is the formula for electric power?
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The formula for electric power is P = VI, where P is power in watts, V is voltage in volts, and I is current in amperes.
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How is power related to energy consumed?
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Power is the rate at which energy is consumed. Energy consumed is power multiplied by time (E = P Ć t).
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What are the units of power?
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The units of power are watts (W), kilowatts (kW), and megawatts (MW).
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What is an electric power circuit example?
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An example is a simple circuit with a battery and a light bulb. Power in this circuit is calculated using voltage from the battery and current through the bulb.
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What happens to power if only the voltage increases?
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If voltage increases while current remains constant, power also increases according to the formula P = VI.
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How can power be calculated using resistance?
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Power can be calculated using resistance with the formula P = IĀ²R, where I is current and R is resistance.
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What is the relationship between power and efficiency?
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Efficiency is the ratio of useful power output to total power input, often expressed as a percentage.
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How is power different in AC and DC circuits?
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In AC circuits, power can vary with time. In DC circuits, power is constant as current and voltage remain unchanged.
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What is the role of transformers in power calculation?
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Transformers change voltage levels, affecting the power distribution without changing frequency, which influences current and efficiency.
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Why is understanding electric power important?
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Understanding electric power is crucial for designing and managing circuits, ensuring safety and efficiency in electrical systems.
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How does the power factor affect AC power calculations?
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Power factor, ranging from 0 to 1, measures efficiency; low values indicate poor efficiency, appearing as phase differences in power calculations.
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What instruments measure electric power?
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Instruments like wattmeters and multimeters measure electric power by assessing voltage and current.
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What is the significance of kilowatt-hour (kWh)?
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Kilowatt-hour is a unit of energy representing the power consumption over time, typically used for billing electricity usage.
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How does resistance affect power in a circuit?
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Higher resistance reduces current for a given voltage, lowering power according to P = VĀ²/R.
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What safety factors must be considered in power calculations?
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Safety factors include maximum voltage levels, current capacities of wires, and circuit breaker settings to prevent overload.
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