Answer: Electrical power is the “rate” at which energy is being consumed in a circuit and as such all electrical and electronic components and devices have a limit to the amount of electrical power that they can safely handle.

## What is the rate at which electrical energy?

**Electric power** is the **rate**, per unit time, at which **electrical energy** is transferred by an **electric** circuit. The SI unit of **power** is the watt, one joule per second.

## What is the formula of electrical energy?

Electric energy = electric power × time = P × t. Thus the formula for electric energy is given by: Electric energy **= P × t = V × I × t = I2 × R × t = V2t / R.**

## What are the two basic kinds of energy?

After hundreds of years of observation and experimentation, science has classified energy into two main forms: **kinetic energy and potential energy**. In addition, potential energy takes several forms of its own. Kinetic energy is defined as the energy of a moving object.

## Can current flow without a source?

Basically, **no**. Current is the flow of electrons and in order to force the electrons to flow (technically called to drift) you have to apply a potential difference between two points in the circuit so that the electric field created will generate a force on the electrons (as per F=qE) and they will start to move.

## How is DC current calculated?

Through Ohm’s law, you can calculate the voltage (V), current (I) and resistance (R) of a DC circuit. From that you can also calculate the power at any point in the circuit. Follow Ohm’s law: **Voltage (V) = Current (I) times Resistance (R)**.

## How do you calculate total voltage?

Total voltage in a series circuit is **equal to the sum of the individual voltage drops E _{Total} = E_{1} + E_{2} +** . . .

## How many volts are in a joule?

Change in energy by moving a single electron across an electric potential difference of one volt. 1 Electron volt (eV) = **1.602176565 x 10 ^{–}^{19} joules** (J).

## What is the relationship between current and power?

Electric current (Ampere) is affected by the amount of power (wattage) and voltage (volts) used, and the relationship is as follows: **The Greater Power (Watt), then the greater Current (Ampere)** **The Greater Voltage (Volt), then the smaller Current (Ampere)** The smaller power (Watt), then the smaller Current (Amperes)

## How is electricity unit calculated?

So a 100-Watt bulb if kept on for 10 hours will consume: 100 x 10 = 1000 Watt-Hour = 1 **Kilowatt-Hour (kWH)** = 1 units (on your meter).