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Transcript
Electricity Within a Circuit
An electric circuit is a continuous pathway for
charges to move.
Circuit Elements and Diagrams
Circuits have 4 basic components:
1) Source – source of electric energy
(where the electricity is coming from)
(battery)
2)
Conductor – the wire through which
the energy flows (wire)
3)
Control – a switch or device that can
turn the circuit on or off. (switch)
4)
Load – items along the circuit that
convert electricity into other forms of
energy (examples: light bulbs, motors,
heaters, speakers).
 Draw fig 4.9 on page 273 into notes.
 Read circuit diagram criteria
 Draw circuit symbols into notes.
 Do extension on page 272 (a, b).
 BLM 4-5
Current
Electric current:
- is the amount of charge that passes a point
in a conducting wire every second.
- is measured in amperes (A) by an ammeter.
(weaker electric currents are measured by a
galvanometer).
- within in a circuit, negative charges
(electrons) flow on a path from the negative
terminal of a battery to the positive terminal
of the battery.
- is similar to a rivers current. A strong river
current means that water flows rapidly; a
fast flow rate.
Voltage
- is the energy of each individual charge.
- The symbol is V and the units are volts (V)
- Voltage is the push that makes electrons
move.
 Demonstration on Current and Voltage
Page 276-277
Hand in analyze questions #1-5 on page 276.
On page 277 hand in questions #1-6
Rivers of Electricity
Read page 278
Energy of a moving electric charge is changed
to different forms as current passes through
the load (ex. Changed to light energy or
mechanical energy)
Page 278 #1-3, 5.