|1 lemon or lime
||1 iron screw 5 cm long
||1 brass screw 5 cm long
|1.5 volt light bulb
||3 insulated wires with striped ends approx. 15 cm
||D cell battery
|1 D cell battery holder
||1 light bulb holder
Task: Complete 4 of the 6 activities listed below in red. Enjoy!
are assembled from cells, connected in series, to increase the voltage
In a cell,
chemical energy is converted into electrical energy.
may be either PRIMARY or SECONDARY types.
cell is discarded when its chemical energy is exhausted.
cell can be recharged.
common primary cell is the zinc/carbon (Leclanche) as used in torches,
portable radios etc.
your own battery. Demonstrate your battery to the class. Click
here for directions.
WHAT IS ELECTRIC CURRENT?
An electric current
is a flow of microscopic particles called ELECTRONS flowing through wires
It can be likened
to the flow of water through pipes and radiators, etc.
As water is
pushed through pipes by a pump, electric current is pushed through wires
Hot water does
work by heating radiators.
does work by heating fires, lighting lamps, ringing bells, electroplating,
A basic law
of the universe is that like charges repel and unlike attract. Two negatives
A negative and a positive will attract each other.
has a negative charge.
(-ve) terminal of a battery will push negative electrons along a wire.
(+ve) terminal of a battery will attract negative electrons along a wire.
will therefore flow from the -ve terminal of a battery, through the lamp,
2. Using two or three wires,
one battery, and one light bulb, build a simple circuit, a parallel
and a series circuit.
here for diagrams.
more basic electronics diagrams and explanations
circuit a closed loop of conductors through which charges can flow
conductor a substance through which electrical charges can easily
current a flow of electrical charges
generator a device for producing electrical current by moving a
coil of wire in a magnetic field
insulator a material through which electric charges cannot move
ion an atom that has gained or lost one or more electrons and is
thus a charged particle
switch a device that closes or opens a circuit, thereby allowing
or preventing current flow
voltage the pressure behind the flow of electrons in a circuit
3. Create a word search or
crossword puzzle using the vocabulary words above.
your word search and crossword puzzle.
students by printing the answer keys.
here to create the word search or a crooss word puzzle
4. Visit Frankenstein's Lightning
Lab. on electrical safety. Place the cursor on a part ot the house
a safety rule.
poster which illustrates one of the safety rules. Click
here to go to Frankenstein's Lab
materials in which it is easy to get electrons to move and provide a flow
of electric current.
are mostly metals such as gold, silver, copper, iron and lead.
is a conductor as well as some gases (as in fluorescent tubes) and water
are not perfect conductors and offer some resistance to the flow of current.
of a conductor (such as a metal rod) is determined by three things:
length. The longer its length the higher its resistance.
cross-sectional area. The bigger this is the lower is its resistance.
material of which it is made.
the value of resistivity the higher the resistance.
measured in OHM METERS.
length x resistivity
Resistance = -------------------------------
5. Find out which objects
conduct electricity. Build the tester described in the conductivity
Fill in the chart.
|Name of object
||Doesn't conduct electricity
6. The measure of energy
per unit charge is measured is called voltage (V) and the unit of
measurement is called volts.
inhibits the amount of current running along the circuit.
simulator to light the light bulb.
your results. Voltage
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