A Home Brewed Worksheet For Sections 11.4
through 11.7 and Section 11.11
SECTION 11.4
1. Metals contain __________ which can _________ freely through
the metal. __________ is the flow of electrons. The rate of flow of
electrons is called _________ and is measured in ____________.
One amp is equal to the flow of _____________ electrons per second.
2. The electrons that flow through a metal wire are supplied by
_________________. Unlike water pipes, the electrons come with
the wires you buy at the hardware store. PPL supplies __________,
not ___________.
SECTION 11.5
1. Electrons flow through materials when there is a difference in
________________. The name for electrical pressure is
___________.
2. Voltage is the potential energy associated with the electrons. A 12
Volt car battery, for example, supplies 12 Joules of potential energy to
every 6.25 billion billion electrons. A car battery can be thought of as
an ________________. Generators are also electric pumps. Electric
pumps provide a difference in _____________ or a ____________.
3. ____________ flows through a circuit due to a _________ across
the circuit.
4. ___________ produces ____________.
1
SECTION 11.6
1. A voltage source moves ___________ in a circuit. How much
current (flow of electrons) there is depends on the voltage and also
the
electrical _____________. The unit of resistance is called the ohm,
whose symbol is the Greek letter omega, _________.
2. Resistance increases with the ____________ of the wire and
decreases with the ___________ of the wire. The kind of material
also affects the resistance. Rubber for example has a __________
resistance, while ___________ has a low resistance.
3. Rank the following pieces of copper according to their resistance
with “1” being the least and “3” being the greatest.
SECTION 11.7
1. The relationship between __________, __________, and
__________ is __________ Law.
2. Ohm’s Law states that
2
Current =
3. The unit of current is the ____________, unit of voltage is the
____________, and the unit of ____________ is the ohm.
4. On the board below, determine how much current flows through
your body, which has a resistance of 100,000
terminals of a 12 V battery.
Ω
, if you touch the
SECTION 11.11
1. Any path along which electrons can flow is a __________. To stop
the flow a switch is provided. When the switch is __________ the
flow stops.
2. Circuits contain devices that receive electric __________. These
devices offer resistance and could be light bulbs, motors, speakers, or
3
heaters. These devices are either connected in __________ or
__________. When connected in series, the devices and the wires
connecting them form a single pathway for electron flow between the
terminals of a __________, __________, or __________. These
devices are sources of energy and are called voltage sources.
3. When connected in parallel, the devices and __________
connecting them form branches, each providing separate paths for
electron flow.
SERIES CIRCUITS
1. For Fig. 1, insert the rest of the wires and show the direction of
the flow of electrons when the switch is closed.
Fig. 1. Light bulb series circuit.
2. When the switch is closed in Fig. 1, the flow of electrons exists
___________ everywhere in the circuit. If one of the bulbs burns
out, the other two ______________ go out _______________.
4
3. The total resistance of a series circuit is equal to the
___________ of the resistances of each device.
4. According to Ohm’s Law the current or flow of electrons is equal to
the voltage supplied by the voltage source divided by the total
____________ of the circuit.
5. The sum of the energies lost at each resistance is equal to the total
energy provided to the __________. Another way of saying this is
that the sum of the _________ drops is equal to the total voltage
supplied by the votage source.
6. As more resistances are added in series the current
____________.
If a fourth light bulb were added to the light bulb circuit shown in Fig.
1, the intensity of each light bulb would __________.
PARALLEL CIRCUITS
1. In a simple parallel circuit electrons leaving the ___________
terminal of the battery (voltage source) need to travel through only
_________ lamp filament before returning to the positive terminal of
the battery.
2. For Fig. 2, insert the rest of the wires so that the bulbs are wired
in parallel.
5
Fig. 2. Light bulb parallel circuit.
3. When the switch is closed, the current flows from the negative
terminal of the battery and then branches into _________ separate
pathways. A break in any one of these paths ___________ interrupt
the flow of electrons in the others.
4. In a parallel circuit, the voltage drop is the same across each
________.
5. The total current in the circuit equals the ___________ of the
currents in its parallel branches.
6. As the number of parallel branches is increased, the overall
resistance of the circuit ____________.
7. As more light bulbs are wired in parallel, the intensity of each bulb
____________.
6