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

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

◂Science Worksheets and Study Guides Sixth Grade. Our impact on earth

Vocabulary/Answer key

Our impact on earth

The resources above cover the following skills:

EARTH AND SPACE SCIENCE

Earth’s Systems

Analyze and interpret data (e.g., tables, graphs, maps of global and regional temperatures; atmospheric levels of gases such as carbon dioxide and methane; rates of human activities) to describe how various human activities (e.g., use of fossil fuels, creation of urban heat islands, agricultural practices) and natural processes (e.g., solar radiation, greenhouse effect, volcanic activity) may cause changes in local and global temperatures over time.

Earth and Human Activity

Analyze evidence (e.g., databases on human populations, rates of consumption of food and other natural resources) to explain how changes in human population, per capita consumption of natural resources, and other human activities (e.g., land use, resource development, water and air pollution, urbanization) affect Earth’s systems.

Implement scientific principles to design processes for monitoring and minimizing human impact on the environment (e.g., water usage, including withdrawal of water from streams and aquifers or construction of dams and levees; land usage, including urban development, agriculture, or removal of wetlands; pollution of air, water, and land).