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Electric Current, Circuits, Resistance and Ohm’s law. MHR pg. 619-632. What is Electric Current?. An electric current is: the movement of electrons ( think of a water current- movement of water)

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Presentation Transcript
what is electric current
What is Electric Current?
  • An electric current is:
  • the movement of electrons ( think of a water current- movement of water)
  • These electrons carry energy ( in volts) and can transfer their energy to a load such as a light bulb
formula for current
Formula for Current
  • I = Q / Δt
  • Where
  • I = current ( amps)
  • Q = amount of charge ( coulombs)
  • Δt = change in time ( seconds)
problem 1 cell phone chargers
Problem #1: Cell phone chargers
  • What is the current travelling through a cell phone charger when 0.20 mC of electrons pass a point in 0.75 min?
  • Answer:
  • 4.4 x 10 -6 A
how do you measure electric current
How do you measure electric current?
  • Review.
  • What is going on with the diagram below?
  • Where would you put the ammeter?
  • Follow the symbols pg. 619 in your text book

How bright are the two light bulbs?

analyse this circuit
Analyse this circuit:

The ammeter goes ______the first light bulb.

How bright are the two light bulbs?

how much energy does each light bulb absorb
How much energy does each light bulb absorb?
  • Measure the voltage ( change in energy) across each light bulb in the circuit below:

The light bulb that is brighter has more or less energy?

how much energy does each light bulb absorb1
How much energy does each light bulb absorb?
  • Measure the voltage ( change in energy) across each light bulb in the circuit below:

How bright are the light bulbs? How much energy does each light bulb require?

electrical resistance r
Electrical Resistance (R)
  • Electrical Resistance: is a measure of how difficult it is for an electrical current to travel through a material
  • High resistance materials: do not allow an electric current to pass through ( example: plastic)
  • Low resistance materials: allow electric current to pass through ( example: copper)
resistor
Resistor
  • An electrical device that has a specific resistance
  • The units for resistor is ohms or Ώ
ohm s law
Ohm’s Law
  • If you were to graph the amount of energy the electrons transfer to a load (V) vs the flow of electrons that pass through a load (I), the graph would look like this:
ohm s law1
Where :

R= resistance ( Ώ)

V = potential difference ( V)

I = current ( A)

Ohm’s Law
your turn
Your Turn…
  • Read pg. 622-625
  • MHR pg. 632 # 21-26 ( blue background)
  • MHR pg. 632 # 1,2 ( yellow background)