# Ohm’s law worksheet download in pdf

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Table of Contents

## What is Ohm’s Law ?

Ohm’s law can be stated as “The Current passing through any conductor is directly proportional to the potential difference between it’s two ends if the physical condition of the conductor do not change.

V = IR this is called ohm’s law equation

Where V= Voltage

I = Current

R= Resistance

## Ohm’s law relationship

Ohm’s law gives the relationship between Current, Voltage and Resistance. by knowing any two values of Current, Voltage and Resistance, we can find the third missing value. ohm’s law is widely used in electronic applications so you must remember ohm’s law formula.

To find the Voltage (V)

V = I x R

To find the current (I)

I = V/R

To find the resistance (R)

R = V/I

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## Ohm’s Law in electric power rating

Electrical elements are given a”power rating” in watts which indicates the highest speed at which the unit converts the electric power into other types of energy like heat, light or movement.

Electrical apparatus convert one kind of electricity into another. So for instance, an electric engine will covert electrical energy into a mechanical power, while an electric generator converts mechanical power into electric energy.

A light bulb transforms electric energy into both heat and light.We also know that the device of electricity is your WATT, but a few electric devices like electrical motors have a power rating in the older dimension of”Horsepower” or hp. The association between frequency and horsepower is provided as: 1hp = 746W. So for instance, a two-horsepower engine has a score of 1492W, (2 x 746) or 1.5kW.

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## Electrical Energy

Electrical power can also be described as the rate of where energy is transferred. If one joule of work is either consumed or delivered at a steady speed of one second, then the corresponding power will be equivalent to a watt so electricity can be defined as”1Joule/sec = 1Watt”.

Then we could declare that one watt is equivalent to one joule per minute and electrical power can be defined as the rate of doing work or the shifting of energy.

## How to calculate electrical energy

Electrical Energy is the capacity to do work, and the unit of work or energy is your joule ( J ). Electrical energy is the product of electricity multiplied by the length of time it was consumed. If we know how much energy, in Watts is being absorbed and the time, in seconds for which it is used, we can get the entire energy utilized in watt-seconds.

To put it differently, Energy = power x time and Power = voltage x current. Therefore electrical power is associated with energy and the device given for electric energy is your watt-seconds or joules.

We said previously that electric energy is described as being watts per second or joules. Although electric energy is measured in Joules it may become a huge value when used to compute the energy absorbed by a component.

But coping with joules, kilojoules or megajoules to express electric energy, the maths involved can wind up with some large numbers and plenty of zero’s, therefore it is far more simpler to state electric energy consumed in Kilowatt-hours.

Then our 100 watt light bulb over will have 2,400 5 hours or 2.4kWhr, which is significantly simpler to understand the 8,640,000 joules.1 kWhr is the amount of power used by a device rated at 1000 watts in 1 hour and is usually referred to as a”Unit of Electricity”.

This is what is measured by the utility meter and is exactly what we as customers purchase from our electricity providers once we receive our invoices.Kilowatt-hours are the standard units of electricity used by the power meter in our houses to figure out the quantity of electric energy we use and therefore how much we pay.

So in case you switch ON an electrical fire with a heating element rated at 1000 watts and left it on for 1 hour you’ll have consumed 1 kWhr of electricity. If you switched two electrical fires each with 1000 watt elements for half an hour that the complete consumption would be precisely the identical quantity of power — 1kWhr.So, consuming 1000 g for one hour uses the identical amount of electricity as 2000 g (twice as much) for half an hour (half time).

Now that we know what’s the relationship between voltage, resistance and current in a circuit, in another tutorial concerning DC Circuits, we’ll look at the conventional Electrical Units used in electronic and electrical engineering to let us compute the values and see that every value can be represented by either multiples or sub-multiples of the conventional unit.