OHM'S LAW CALCULATOR

This calculator will help determine the electrical current flowing through an energized system. Do you maybe want to install a new water pump? This documentation should help.

WHAT IS ELECTRIC CURRENT?

Electric Current is the flow of electrons through a conductor. The higher the number of electrons flowing, the higher the current value.

The SI Unit of electric current is Ampere(A).

Sub-units of Amperes

The sub-units of Amperes are:

1. milliamperes(mA)

2. microamperes(μA)

Convert the following values:

1. 0.89mA to A

1mA=0.001A

0.89mA=?

= 0.00089A

2. 6.7µA to A

6.7μA=?

1μA=0.000001A

= 6.7 * 10-6 A

CURRENT IN SERIES

                                                       (image source: Pathwayz)

Current is the SAME in each device since there is only a single pathway for the charge to flow.

CURRENT IN PARALLEL

                                         (image source: Pathwayz)

Why DO ELECTRONS MOVE?

This is because of voltage. Voltage pushes electrons through the conductors.

It's SI Unit is Volt(V).

VOLTAGE IN SERIES

                                                                      (image source: Electrical 4 U)

V_T=V₁+V₂+V₃+...+V_n

VOLTAGE IN PARALLEL

(Image source: BCcampus)

RESISTANCE

In as much as electrons are pushed the conductors themselves e.g. Copper cables, provide friction to the electron's flow.

The SI Unit is in Ohms(Ω).

RESISTANCE IN SERIES

(Image source: Electronics Tutorials)

RESISTANCE IN PARALLEL

(Image source: Electronics Tutorials)

WHAT IS OHM'S LAW?

Ohm's Law is the relationship between Current, Voltage and Resistance.

Formula:

V=IR

where V = voltage, in volts(V)

           I = current, in amperes(A)

           R = resistance, in ohms(Ω)

To be able to remember the formula easily we can use a memory triangle

(Image source: electronics-tutorials)

From the memory triangle above we can come up with three equations:

(Image source: Electronicnotes)

POWER

You can express Current(I) in terms of Electric Power(P):

I=P/V

where P is the power in Watts(W).

OHM'S LAW AND RESISTANCE

There are several factors that affect the resistance of a conductor;

• MATERIAL
  • Some materials have higher resistance compared to others.
• LENGTH
  • Longer wires have greater resistance.
•    THICKNESS
  • Smaller diameter wires have greater resistance.

• TEMPERATURE

  • Heating a wire increase its resistance

REFERENCES

• What is Electric Current? https://en.wikipedia.org/wiki/Electric_current
• Current in Series. https://www.google.com/search?q=current+in+series&oq=current+in&aqs=chrome.0.69i59l2j69i57j69i59j0i20i263i512j69i60l3.3563j0j7&sourceid=chrome&ie=UTF-8
• Current in Parallel. https://pressbooks.bccampus.ca/basicelectricity/chapter/ground/
• Voltage in Series.https://pressbooks.bccampus.ca/basicelectricity/chapter/ground/
• Voltage in Parallel.https://www.electrical4u.com/voltage-in-parallel/
• Resistance in Series.https://www.electronics-tutorials.ws/resistor/res_4.html
• Resistance in Parallel.https://www.electronics-tutorials.ws/resistor/res_4.html
• Why do electronshttps://www.electrical4u.com/voltage-in-parallel/ move? https://www.teachengineering.org/lessons/view/cub_electricity_lesson03#:~:text=The%20%22electrical%20pressure%22%20due%20to,terminal%20to%20the%20negative%20terminal.
• Ohms formulas. Electronics notes. https://www.electronics-tutorials.ws/wp-content/uploads/2018/05/dccircuits-dcp23.gif
• Power. https://eepower.com/tools/dc-circuit-power-calculator/#:~:text=Current%20is%20the%20rate%20of,product%20of%20voltage%20and%20current.&text=P%3DVXI.,P%20%3D%20V%20X%20I%20.
• Ohm's Law and Resistance. https://www.bbc.co.uk/bitesize/guides/z8b2pv4/revision/1#:~:text=Ohm's%20Law%20and%20resistance,-All%20conductors%20show&text=material%2C%20eg%20copper%2C%20has%20lower,a%20wire%20increases%20its%20resistance