Lesson 10

Electricity — Ohm's Law
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This lesson contains 17 slides, with text slides and 2 videos.

time-iconLesson duration is: 45 min

Items in this lesson

Electricity — Ohm's Law

Slide 1 - Slide

This lesson
  • Current - Voltage - Resistance — Recap
  • Ohm's law

Slide 2 - Slide

Learning goals
  • You can explain what current, resistance and voltage are in your own words and name the correct unit for each.

  • You can describe the difference between how current is measured and how voltage is measured.

  • You can describe how voltage gets divided over series and parallel circuits.

  • You can name Ohm's law in words and in symbols and you can do calculations with it.

Slide 3 - Slide

Current – Resistance – Voltage

Slide 4 - Slide

Slide 5 - Video

Slide 6 - Slide

Current


Symbol: I

Unit: Ampere
 Symbol for Ampere: A


The amount of charge (measured in Coulombs)
flowing through a circuit per second (Coulombs / second )
Examples:
  • Current = 0.8 Ampere
  • I = 0.8 A

Slide 7 - Slide

Resistance

Symbol: R

Unit: Ohm
 Symbol for Ohm: Ω


Resistance is the opposition to current flow.
Examples:
  • Resistance = 5 Ohm
  • R = 5 Ω

Slide 8 - Slide

Voltage



Symbol: V

Unit: Volt
 Symbol for Volt: V 


Voltage (potential difference) is the difference in the amount of electrical energy between two points in a circuit.
Examples:
  • Voltage = 5 volts
  • V = 5 V

Slide 9 - Slide

Slide 10 - Slide

Ohm's law

Slide 11 - Slide

Slide 12 - Video

Ohm's law
Current=ResistaneVoltage
I=RV

Slide 13 - Slide

Ohm's law
Current=ResistaneVoltage
I=RV
  • Current (I)  —       Ampere (A)
  • Voltage (V) —       Volt (V)
  • Resistance (R) — Ohm (Ω)

Slide 14 - Slide

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Practice exercise
A) An average refrigerator works on a voltage of 120 Volts. A normal resistance for a refrigerator can be 45 Ohm. Calculate the current flowing through a refrigerator that has these properties.


B) What would the resistance on a fridge that has the same voltage have to be if it has a current of 2.4 Ampere flowing through it?

Slide 16 - Slide

Learning goals
  • You can explain what current, resistance and voltage are in your own words and name the correct unit for each.

  • You can describe the difference between how current is measured and how voltage is measured.

  • You can describe how voltage gets divided over series and parallel circuits.

  • You can name Ohm's law in words and in symbols and you can do calculations with it.

Slide 17 - Slide