Physics of Energy

Physics - Energy, Electricity, Physical Quantities & their SI Units

Physical Quantities & SI Unit

• Time - second (s)

• Length - meter (m)

• Mass - kilogram (kg)

• Temperature - kelvin

• Speed - meter per second(m/s)

• Force - Newton (N)

• Acceleration - m/s²

• Current - Ampere (A)

• Energy - joule (J)

• Amount of substance - mole

Energy & its Sources

​Energy is the ability to do work. The SI unit of energy is joules (j).

• Solar - sun

• Hydraulic - water

• Thermal - heat

• chemical - from batteries & food

• Kinetic - movement/motion

• Potential - position

• Wind - wind

• Geothermal - heat from the earth

Electricity is the flow of electrical power/charge.

• Wire - conductor

• Battery - source

• Switch - controler

• Light bulb - consumer

Electricity

In an open circuit, there is no flow of electrical currents.

​​Open Circuit

In a closed circuit, electrical charges flow around the circuit.

​​Closed Circuit

Things you have to know

• Current - the amount of electricity flowing in a circuit.

• Ampere - is the SI unit of current.

• Ammeter - is a device that mesures current.

• Voltage - is a measure of how strong the current is in a circuit.

• Volt - is the SI unit of voltage.

• Voltmeter - a device to measure voltage with.