Lesson 4 of 21
In Progress

Ohms Law

NAC-Trainer April 24, 2020

Ohms law as defined by Collins dictionary is

Ohm’s law is a law that states that the voltage across a resistor is directly proportional to the current flowing through the resistance. Ohm’s law is named for German physicist Georg Ohm (1789-1854). A simple formula, Ohm’s law, is used to show the relationship between current, voltage, and resistance.

With two knowns measurements we can calculate the unknown measurement.

We can use two triangles to make this process simple.

V (divided by) I (times) R

P (divided by) I (times) V

The four prefixes that are used with the two ohms law triangles are as follows.

  • Volts (V)
  • Currents / Amps (I)
  • Resistance / Ohms (R)
  • Power / Watts (P)

We have a resistance of 23.79 (rounded up to 24 to make the calculation simpler) and we know the UK voltage is 230V. So the current (I) this element uses can be calculated. Voltage divided by resistance = current

230V divided by 24Ω = 9.58 amps (I)

Please see the video below

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