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Quarter 3 Test 2 Review
1
Typically, household appliances operate at 120
volts. What is the current flowing in the circuit of
a microwave when the resistance of the microwave
oven is 30 ohms?
2
If the current moving through the filament of a
light bulb is 0.5 amps when the voltage across the
bulb is 120 volts, what is the resistance of the
bulb?
3
A miniature light bulb with a resistance of 3 ohms
is connected to a 6-volt source. How much current
will flow through the bulb?
4
A student connects three 1-ohm light bulbs to a 9volt battery in parallel. The total circuit current is
____ ampere(s).
5
What does Kirchoff's current law state
6
The wiring in your home uses ____ circuits
7
A student connects six 3-ohm light bulbs in series
to a 9-volt battery. The total circuit current is
____ ampere(s).
8
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?
9
A stereo receiver is plugged into a 120-volt outlet.
If the receiver has a resistance of 240 ohms, how
much current does it use?
10
As Jing toasts her morning waffle in the family
toaster, 4.0 amps of current flows with a voltage of
120 volts across the toaster. The resistance of the
toaster is _______.
11
An ohm is the unit of measurement for_______.
12
In an electrical circuit, the term current refers to
what?
13
The motion of charges in wires, motors, light
bulbs and other devices is best called
electric______.
14
Use the series circuit pictured to the right to
answer questions (a), (b), and (c).
a. What is the total resistance of the circuit?
b. What is the current in the circuit?
c. What is the voltage drop across each resistor?
15
Use the series circuit pictured right to answer
questions (a), (b), and (c). Consider each resistor
equal to all others.
a. What is the resistance of each resistor?
b. What is the voltage drop across each resistor?
16
Use the parallel circuit pictured right to answer
questions (a) - (d).
a. What is the voltage across each resistor?
b. What is the current in each branch?
c. What is the total current provided by the batteries?
d. Use the total current and the total voltage to
calculate the total resistance of the circuit.
17
Calculate the equivalent resistance of:
a. Three 8 Ω resistors in parallel
b. Two 6 Ω resistors and a 2 Ω resistor in parallel
c. A 1 Ω, a 2 Ω, and a 3 Ω resistor in parallel
18
A toaster is plugged into a 120-volt household
circuit. It draws 5 amps of current.
a. What is the resistance of the toaster?
b. What is the power of the toaster in watts?
c. What is the power in kilowatts?
19
A clothes dryer in a home has a power of 4,500
watts and runs on a special 220-volt household
circuit.
a. What is the current through the dryer?
b. What is the resistance of the dryer?
c. How many kilowatt-hours of electricity are used
by the dryer if it is used for 4 hours in one week?
d. How much does it cost to run the dryer for one
year if it is used for 4 hours each week at a cost of
$0.15/kWh?
20
A. In your own words, state the relationship
between resistance and current in a circuit.
B. In your own words, state the relationship
between voltage and current in a circuit.