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Quiz Review
1) Open Circuit
d) A circuit with the switch turned to off or a
circuit with any break
A circuit (a circle) must be complete for the
switch to be “on” if there is any break or open
spot, it is an “open circuit”.
2) Closed Circuit
f) A circuit with the switched turned on, or a
completed circuit.
A circuit (a circle) must be complete for the
switch to be “on” if there are no breaks, it is a
closed circle, or “closed circuit”
3) Battery
a) A device using chemical energy to push
current in a circuit.
A battery acts as a pump to push electrons
through a circuit. In the last unit, we learned
that a battery is a source of potential (stored)
electrical enerergy.
4) Resistance
e) The ability to resist current flow.
This is a property of materials that resists
current flow, much like a kink in a hose or a
bottle neck resists the flow of water. A
resistor reduces the pressure (voltage) of the
water flowing through it.
5) Resistor
h) In a circuit diagram, an object that uses
electrical energy is usually represented by one
of these.
Any object, a bulb, a toaster, a piece of
electronics can be a resistor.
6) Ohm’s Law
c) The mathematical relationship between
current, voltage and resistance.
Ohm’s law is represented by the equation:
V = I x R, or I=V/R, or R = V/I
7) Conductor
g) An object through which electricity passes
easily
Any passage of electricity is said to be
conduction. If it is easy, then the object or
material is a conductor.
8) Insulator
b) An object that conducts electricity poorly
Any passage of electricity is said to be
conduction. If it does NOT conduct electricity
easily, then it is an INSULATOR.
Question 9
• A microwave uses a current of 4 amps to heat Mr.
Franz’s coffee, The voltage in the wall outlet is
120 volts. Calculate the resistance of the
microwave.
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•
•
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Look at what we want, R
R= V/I
R=120 V / 4 A
R=30  (ohms)
Question 10
• A light bulb needs 2 amps to produce light. If the
resistance of the bulb is 3 ohms, how many 1.5
volt batteries do you need to make it light?
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•
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•
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Look at what we want, V
V=I x R
V = 2A x 3 
V=6V
If each battery is 1.5 V, then we need 4 of them
Question 11/12
• The diagram below pictures three identical
light bulbs, each with a resistance of 1 ohm,
which are connected by resistance-free wires.
A 9-volt battery supplies energy to the circuit.
• The total resistance for the circuit shown in
the figure is:
• Look at what we want, R
• For a series circuit, we just add the resistance
• RT = R1+R2+R3 = 1  +1  +1  = 3 
Question 13/14
• The current for the circuit shown is:
• The voltage drop across each light bulb above
is ____ volt(s).
Question 15
• Suppose you connect more and more light
bulbs in series to a battery. What happens to
the brightness of each bulb as you add more
bulbs?
Question 16
• The current in a series circuit:
Question 17
• The current in a series circuit ( is always the
same / may be different ) in different parts of
the circuit.
Question 18
• The voltage in a series circuit ( is always the
same / may be different ) in different parts of
the circuit.
Question 19
• The current in a parallel circuit ( is always the
same / may be different ) in different branches
of the circuit.
Question 20
• The voltage in a parallel circuit ( is always the
same / may be different ) in different branches
of the circuit.
Question 21
If each resistor is 2-ohms, what is the voltage
drop across each resistor in the diagram
below:
What are we looking for?
Question 22
• The voltage drop across each resistor in the
circuit below is ____ volt(s).
What are we looking for?
Question 23
• The current in each resistor in the circuit is
____ ampere(s). The total current is ____
amps.
What are we looking for? I = V/R
This is a parallel circuit, so V is the same
everywhere.
Question 24
What is the voltage drop across each resistor?
What are we looking for? V
This is a parallel circuit, so V is the same
everywhere.