**Contents**show

## How do you calculate power?

**Power is equal to work divided by time**. In this example, P = 9000 J /60 s = 150 W .

## What are the three formula for electrical power?

**P = ΔV ^{2} / R**

We now have three equations for electrical power, with two derived from the first using the Ohm’s law equation. These equations are often used in problems involving the computation of power from known values of electric potential difference (ΔV), current (I), and resistance (R).

## What is the formula of electric power?

The electric power in watts produced by an electric current I consisting of a charge of Q coulombs every t seconds passing through an electric potential (voltage) difference of V is **P=QVt=IV P = QV t = IV** , where Q is electric charge in coulombs, t is time in seconds, I is electric current in amperes, and V is electric …

## How do you calculate electric current?

If the voltage (V) and resistance (R) of any circuit is given we can use the current formula to calculate the current, i.e., **I = V/R (amps)**.

## What are the 3 formulas in Ohm’s law?

3-4: A circle diagram to help in memorizing the Ohm’s Law formulas **V = IR, I = V/R, and R= V/I**. The V is always at the top.

## How do you calculate powers without a calculator?

Write a multiplication sign between each of the base numbers that you have just written. An exponent is a number being multiplied by itself a certain number of times, and this is what you are representing when you write the multiplication signs between base numbers. **Multiply out your new equation**.

## What is 4 as a power of 2?

Answer: 4 to the power of 2 can be expressed as 4^{2} = 4 × 4 = **16**.