Electrical Power

Electrical power is the rate at which electrical energy is transferred by an electric circuit. It is measured in watts (W) and is the product of voltage (V) and current (I) in a circuit.

Key Concepts

• Voltage: The force that moves electric charges through a conductor. It is measured in volts (V).
• Current: The flow of electric charges through a conductor. It is measured in amperes (A).
• Power: The rate at which electrical energy is transferred by an electric circuit. It is measured in watts (W).
• Formula: Power (P) = Voltage (V) x Current (I)

Calculating Electrical Power

To calculate the electrical power in a circuit, you can use the formula: P = V x I, where P is the power in watts, V is the voltage in volts, and I is the current in amperes.

Units of Power

In addition to watts, electrical power can also be measured in kilowatts (kW) and megawatts (MW) for larger electrical systems.

Uses of Electrical Power

Electrical power is used for various applications, including lighting, heating, cooling, and powering electronic devices.

Study Tips

1. Understand the relationship between voltage, current, and power.
2. Practice solving power calculations using the formula P = V x I.
3. Explore real-world examples of electrical power usage in different devices and appliances.
4. Review the units of power and their conversions (watts to kilowatts to megawatts).