The post Voltage Current Resistance Triangle [VIR Triangle] appeared first on Ohm Law.

]]>The triangle illustrates the three formulas:

V = IR

I = V/R

R = V / I

Let’s understand these.

**V = IR: Voltage is a product of current and resistance**

**I = V/R: Current is defined as the ratio of voltage to resistance**

**R = V/I: Resistance is defined as the ratio of voltage to current**

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]]>The post Top 5 Practical Applications of Resistors in Our Daily Life [Complete Explanation of Examples and Uses] appeared first on Ohm Law.

]]>Your laptop charger has tens (if not hundreds) of resistors for controlling current flow through different components. The figure below displays the resistors in the opened laptop charger.

Just like the laptop, a mobile phone charger contains a number of resistors that are responsible for controlling the required amount of current. You might have noticed the amount of current on your mobile charger displaying something like 500 mA, 700 mA, 900 mA, 1.0 A or 2.0 A. This is actually the amount of current. A resistor is a basic component responsible for controlling this flow through the mobile phone.

All of us are familiar with the rotating knob that is used for controlling the fan speed. The rotating knob is actually a potentiometer whose rotation changes the amount of resistance.

The electronics circuits in CFL, LED and other lightning lamps contain resistors. The figure below displays an opened CFL containing metal film resistor (gray).

Automatic street lighting system uses LDR (light dependent resistors) in their working. A photoresistor is variable resistance device whose resistance changes with the light intensity falling upon it. During daylight, the resistance of lamps is adjusted to turns off the lights. When the sun falls the resistance also changes, this variation in resistance is used to turn on the lights.

Resistors are present everywhere in our life. All electronic boards and devices utilize them. Our laptop boards, mobile phone, juicer machine circuits, home accessories all contain SMD resistors. They are used in kettles, lamps, geezers, speakers, headphones and almost all electronic/electrical devices. But what makes them popular is Ohm’s law. To understand more applications have a look at these 12 Ohm’s law formulas.

Also, learn the Practical applications of Ohm’s law in daily life.

The post Top 5 Practical Applications of Resistors in Our Daily Life [Complete Explanation of Examples and Uses] appeared first on Ohm Law.

]]>The post Ohm’s law: A circuit has a source voltage of 50v and a current of 10a. what is the power in watts appeared first on Ohm Law.

]]>Answer: 500 watts

Step by Step Solution:

From **Ohm’s law triangle** the formula for power:

P = VI

Where

V = Voltage = 50 V

I = Current = 10 A

**P = 50 * 10 = 500 W**

So that was all.

Learn more about Ohm’s law and other useful formulas.

The post Ohm’s law: A circuit has a source voltage of 50v and a current of 10a. what is the power in watts appeared first on Ohm Law.

]]>The post Ohm’s law Question: In any circuit current is inversely proportional to appeared first on Ohm Law.

]]>- Voltage
- Resistance
- Both of these
- None of these

Correct answer: Voltage

In any circuit, the current is inversely proportional to resistance and directly proportional to applied voltage. The statement about is based on the definition of **Ohm’s law**.

From mathematical formula V = IR:

Current = Voltage / Resistance

Let’s consider voltage is constant having value 20 V.

Now for the resistance of 10 ohms

Current = 20 V / 10 ohms = 2 A … (1)

Let’s now increase the resistance to 30 ohms

Current = 20 V / 30 ohms = 0.66 A … (2)

Comparing both equations we observe the higher value of resistance lowers the electric current through a circuit.

The post Ohm’s law Question: In any circuit current is inversely proportional to appeared first on Ohm Law.

]]>The post Application of Ohm’s Law to Complete Circuit [Full Explanation] appeared first on Ohm Law.

]]>Mathematically: V = IR. In this article, you’ll learn the application of Ohm’s law to complete the circuit.

This tutorial assumes you understand fundamental concepts, if not, you can start learning the Ohm’s law here.

Let’s consider the circuit below:

The input voltage to the 200 ohms resistor is provided by a 12 V dc battery. We are interested in finding unknown current (I) through the circuit.

The current I is the ratio of voltage to a resistance.

Mathematically: **I = V/R = 12 V/ 200 ohms = 0.06 Amps**

Also learn:

- Ohm’s law graph for different resistors
- Wheel containing 12 different Ohmic equations
- Ohm’s law for series circuits
- Experiment for learning it

The post Application of Ohm’s Law to Complete Circuit [Full Explanation] appeared first on Ohm Law.

]]>The post Ohm’s law Example # 1: Find Current through 2.2 kiloohm Resistor when input is 12 V source appeared first on Ohm Law.

]]>The circuit diagram:

In our present case, we are interested to find the current. The basic formula V = IR will be used.

I = V/R = 12 V / 2.2 kΩ

= 5.45 A

The post Ohm’s law Example # 1: Find Current through 2.2 kiloohm Resistor when input is 12 V source appeared first on Ohm Law.

]]>The post Ohm’s law Definition [Define Ohm’s Law] appeared first on Ohm Law.

]]>Mathematically V = IR

Other Ohm’s law articles:

The post Ohm’s law Definition [Define Ohm’s Law] appeared first on Ohm Law.

]]>The post How slope of a voltage-current graph relates to resistance appeared first on Ohm Law.

]]>Let’s check the Ohm’s law plot for different resistors.One can easily understand that increase of resistance decreases the slope of the graph.

The maximum height of slope actually represents the current.

The current at 9 V can be calculated by using the formula:

I = V/R = 9V / 1k = 9 mA

In case of 47 k resistor the current is:

I = V/R = 9V/47 k = 0.19 mA

From above two cases, one can easily understand that why slope decreases with the increase of resistance.

Also, read:

Ohm’s law triangle: A visual relationship of Ohmic formulas which make it easier to

Ohm’s law wheel: A circular wheel with 12 different formulas for calculating voltage, current, resistance, and power.

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]]>The post Ohm’s Law Graph for 1 k, 2.2 k, 4.7 k, 10 k, and 47 k Resistors appeared first on Ohm Law.

]]>Putting it all together:

The slope of the curve decreases with the resistance. However, all plots are still straight lines.

Other useful articles:

The post Ohm’s Law Graph for 1 k, 2.2 k, 4.7 k, 10 k, and 47 k Resistors appeared first on Ohm Law.

]]>The post Units of Quantities used in Ohm’s Law appeared first on Ohm Law.

]]>Quantity | Symbol | Units | Abb |
---|---|---|---|

Voltage | V | volts | V |

Current | I | ampere | A |

Resistance | R | ohms | Ω |

Power | P | watts | W |

All these quantities are linked together in Ohm’s law formulas.

V = IR & P = VI are the basic quantities which relate them.

The statement P = VI is actually Joule’s law.

Useful articles:

Ohm’s law: Learn the basic Ohm’s law, its theory and detail of all quantities which are presented here.

Statement: 12 different statements which are helpful to develop a crystal clear concept.

Lab report: The brief lab report with steps, diagrams, and tables.

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