How is electrical energy and power calculated in a DC circuit?

Electrical energy and power in a DC circuit are calculated using the equations P=VI and E=Pt.

In a DC circuit, electrical power can be calculated using the equation P=VI, where P is power in watts, V is voltage in volts, and I is current in amperes. This equation shows that power is directly proportional to both voltage and current. Therefore, increasing either voltage or current will increase the power in the circuit.

Electrical energy can be calculated using the equation E=Pt, where E is energy in joules, P is power in watts, and t is time in seconds. This equation shows that energy is directly proportional to both power and time. Therefore, increasing either power or time will increase the energy in the circuit.

It is important to note that electrical power and energy are both scalar quantities, meaning they have only magnitude and no direction. They are also both measured in SI units, with power measured in watts and energy measured in joules.

Overall, understanding how to calculate electrical power and energy in a DC circuit is crucial for analysing and designing electrical systems, as well as for understanding the behaviour of electrical components such as resistors, capacitors, and inductors.