Lesson 3 — Current

Class layout – Science
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Class layout – Science

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Class layout – Science

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Chapter 9 Electricity

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Circuits
  • Recap
  •  Checking the homework
  • Current
  • Series and parallel circuits

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Recap

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What does this symbol stand for in a circuit diagram?
A
A blocker of electric flow
B
A battery
C
A heating element
D
A lamp

Slide 6 - Quiz

Will there be a flow of electric current in this circuit?

There are two correct answers
A
No, because the switch is open
B
Yes, because the switch is closed
C
Yes, because the two poles of the battery are connected
D
No, because the two poles of the battery are not connected

Slide 7 - Quiz

What direction will the electric current in this circuit flow in? (from the point of view of the battery)
A
Left to right
B
right to left

Slide 8 - Quiz

What direction will the electric current in this circuit flow in? (from the point of view of the battery)
A
Left to right
B
right to left

Slide 9 - Quiz

Electricity is:
A flow of electrons from a negatively charged pole to a positively charged pole.

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Circuits

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Doorbel
loudspeaker

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electricity — three core properties
  • Current
  • voltage
  • Resistance

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Current

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Current
In water: 
  • The amount of water that flows by per second
  • Expressed in: liters / second

In electricity:
  • The amount of electric charge that flows by per second
  • Expressed in: coulombs / second (ampere)
  • Note: 1 coulomb is 6.24 • 1018 electrons.

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Current
The amount of electric charge that flows by per second.
  • Expressed in: Ampere
  • 1 ampere is 1 coulomb/ second

1 coulomb stand for 6.24 • 1018 electrons

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Current
The amount of electric charge that flows by per second.

The unit of current is: Ampere (A)
  • One ampere is one coulomb / second
  • One coulomb is 6.24 • 1018 electrons.

Ampere can also be expressed in:
milliampere (mA) — 1A = 1000 mA

I=tQ
I: current (ampere)
Q: charge (coulombs)
t: time (seconds)

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ammeter

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ammeter

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Series and parallel circuits
Parallel circuit
series circuit

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Homework
Worksheet - the word problems
9.6 The yellow block exercises

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