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Section 15.2Section 15.2
Electrical energy and voltageElectrical energy and voltage
Section 15.2Section 15.2
Electrical energy and voltageElectrical energy and voltage
VoltageVoltage
Electrical energy transformationElectrical energy
transformation
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Electrical energy transformation
Dry cells supplies electrical energy"push" electric charges
through circuit
15.2 Electrical energy and voltage (SB p. 44)
Go to
Activity 1Activity 1
electrons
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Different types of batteries
Electrical energy transformation
15.2 Electrical energy and voltage (SB p. 44)
car battery
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Voltage
Voltage
15.2 Electrical energy and voltage (SB p. 44)
pointsthethroughChargepointstwobetween
formsotherintoconvertedEnergy
=
Q
EV =
Unit: volt (V)
voltage (V)
CAL
Workshop 2
Voltage
http://cal/E-SimPhy_403.exe
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Voltage can be measured by
Measuring voltage
15.2 Electrical energy and voltage (SB p. 45)
voltmeter millivoltmeter
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Measuring voltage
15.2 Electrical energy and voltage (SB p. 45)
To measure the voltage
connect
in parallel
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Measuring voltage
15.2 Electrical energy and voltage (SB p. 45)
Multimeter
can measure:
voltage
current
resistance
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To section 15.3
http://e-ch15_03.ppt/http://e-ch15_03.ppt/
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Lets start:
1. Insert a zinc plate and a copper plate
into a lemon.
2. Connect a light bulb to
the two metal plates
with connecting wires.
Activity 1Activity 1
Lemon voltaic cellLemon voltaic cell
15.2 Electrical energy and voltage (SB p. 43)
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3. What happens to the light bulb? Explain
briefly. (Hint: Chemical reactions occur
between the metal plates and the lemonjuice.)
Activity 1 (Cont)Activity 1 (Cont)
Lemon voltaic cellLemon voltaic cell
The light bulb is lit. Since chemical reactions
occur between the plates and the lemon juice, a
voltage is set up in the closed circuit.Therefore an electric
current flows through the
plates, lemon and light bulb.
Ans
wer
15.2 Electrical energy and voltage (SB p. 43)
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