Measuring Current

1
Measuring Current

• Learning Objective
• Use an ammeter with care
• Measure and record current in simple series
  circuits

Starter Drawing Circuit Diagrams
2
Starter Draw Circuit Diagrams for the following
A
B
D
C
3
Series Circuit
This is a simple series circuit. In a simple
series circuit, everything is connected in one
loop across the terminals of the battery. There
are no places (junctions) where the current can
split
lamps
4
Series
The current goes in one loop only
5
Circuits digrams
1) A cell, a bulb and a switch in series
2) A battery of cells, a switch and two bulbs in
series
6
Measuring electric current
We can measure the amount of electric current
flowing through a circuit using a device called
an ammeter.
7
Measuring Current

• Method
• THIS IS THE SAME CIRCUIT
• Build the first circuit. Write down the reading
  on the ammeter.
• Now build the 2nd circuit. Write down the reading
  on the ammeter.
• Build the 3rd circuit and write down the ammeter
  reading.

A
A
A
8
Current in a series circuit
2 amps here
2 amps here
A
A
A
2 amps here
The current in a series circuit is THE SAME at
any point
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Conclusion

• The reading on the _____________ shows the amount
  of _____________ flowing around the _____________
  .
• The current is the _____________ everywhere in
  the _____________ . The current is not
  _____________ by the bulbs.

Key words ammeter circuit current same
used up