Download 1 - Rocky View Schools

1. Complete the following.
(a) Define electricity
A natural phenomenon known only by its effects, as electric charge, electric current,
electric field, electromagnetism; the measurable flow or existence of subatomic particles.
(b) Complete the following system diagram.
Input
Process
Output
A power source (battery)
A path (wire)
A load (lamp)
(c) Define an electrical circuit.
Electric circuits provide a continuous pathway for charges to move.
(d) Use the following diagram to identify and describe the key components in a circuit.
The conductor (wire) is what allows the charges to move freely through out the whole
circuit. The out put device which is the load (lamp) which is an item along the circuit that
converts electricity into other forms of energy. The source (battery) is what generates
electrical energy. And the control is optional but is very handy in a circuit that has a
purpose it is used to turn that flow of electrical energy on or off.
Component
Description of the
Component
Battery: The battery is
the source of
electrical energy.
Light bulb: The light
bulb is the item(s)
along the circuit that
convert electrical
energy into other
forms of energy (load)
The switch is the
control which is used
to turn the circuit on
or off
The wire is the
conductor through
which the current
flows.
This a basic circuit
which has the three
necessary parts (load,
conductor, source)
and also a switch to
turn the circuit on or
off.
To control electricity
flowing in a circuit it
is sometimes
necessary to reduce
the current. To do this
we use resistors and
the amount of
resistance is shown on
the resistor by a
number of coloured
bands.
Draw a Sketch of the Symbol Used to
Represent the Component.
4. Use the rules above to draw a circuit diagram of the circuit that you just made.
Location of Ammeter
1
Amperes of current
flowing through the
circuit at that point
(A)
0.9996
2
3
0.9988
0.9988
4. Add a second light bulb to the electric circuit and record the electric current passing
though the circuit.
Location of Ammeter
1
Amperes of current
flowing through the
circuit at that point
(A)
0.4999
2
3
Location of Voltmeter
1 – across the battery
2 – across the light bulb
3 – across any two points in
the circuit
0.4997
0.4997
Potential Difference Or
Voltage
(V)
10
9.9880
0.0010
4. Add a second light bulb to the electric circuit and record the electric current passing
though the circuit.
Location of Voltmeter
1 – across the battery
2 – across the light bulb
3 – across the second light
bulb
4 – across any two points in
the circuit
Potential Difference Or
Voltage
(V)
10
4.9973
4.9973
0.0005
Topic 2 – Electricity within a circuit Pg. 278
1. Copy the electric terms into your note book. Write the water (hydraulic) related term from the column
of terms on the right that best typifies each electric term next to it. For each pair of terms, describe why you
think they are similar.
A) Load: An item along a circuit that converts electricity into other forms of energy.
The electric term load is related to the hydraulic term water wheel because the load is an item that converts
electricity into other forms of energy as well as the water wheel it harnesses the energy of moving water as
it flows down hill.
B) Switch: Used to open or close a circuit to control the flow of the current through it.
The electric term switch is related to the hydraulic term valve because the switch is used to open or close a
circuit to control the flow of the current through it as well as the valve is used to open and close a pipe to
control the flow of water through it.
C) Electric current: The current that flows through the conductor.
The electric term electric current is related to the hydraulic term pressure.
D) Voltage: A common term referring to potential difference.
The electric term voltage is related to the hydraulic term flow rate because voltage is a common term
referring to potential difference which is a measure in the difference in energy per unit of charge between
one point in the circuit and another point in the circuit and the flow rate is a measure of the rate the water
flows through the hydraulic system.
E) Battery: A combination of cells, either wet or dry.
The electric term battery is related to the hydraulic term pump because the battery is the energy source that
moves the electric charges through the circuit and the pump is the energy source that moves the water
through the pipes hydraulic system.
F) Conductor (wire): A material that allows charges to move freely; most metals are conductors.
The electric term conductor is related to the hydraulic term pipe because the conductor or wire allows the
electric current or charges to move freely through the circuit as well as the pipes allow water to move freely
through the hydraulic system.
2. Draw a circuit diagram using symbols. Include a battery, a switch, a lamp, an ammeter, and conducting
wires. Add arrows to show the direction of the flow of electrons. Describe the function of each part of the
circuit.
3. The negative terminal of the voltmeter is attached
using a conductor to the side of the light bulb closest
to the negative terminal of the battery or cell.
The positive terminal of the voltmeter is connected
to the side of the light bulb closest to the positive
terminal of the battery or cell.
4. Apply The current passing through the electric
iron would be greater because an iron requires far
more energy (E in joules) than the much smaller
razor. Since V = E/Q (Q = E/V) the iron would
require more coulombs of charge than the razor. If
I = Q/t and Q is larger than I, the current would be
greater.
5. Thinking Critically The voltage across the light
bulb would be 12 V.