Download Review Sheet Chemistry Electrons and Bonding “Tuiz”

Name ________________________
Miss Fry, Physics
Review Sheet Physics Electricity Test
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What is an electric current? (definition)
What is a battery? (definition)
What is an electric circuit? (definition)
What is current measured in? ________ What is resistance measured in? ________ What is
power measured in? __________ What is the potential difference measured in? ________
5. What is a parallel connection? What is a series connection? (definition or explanation)
6. A parachutist falls into one power line but is not touching the ground. Is he electrocuted?
Why or why not? What if the parachutist is touching both the ground and the line at the
same time? Explain. Finally, what if the parachutist is touching two different lines at the
same time? Explain.
7. What is the third prong of the outlet for?
8. Why did Mom always tell you not to touch something that is plugged in with wet hands?
9. If a string of Christmas lights was wired to be a series circuit, and one of the lightbulbs
burned out, what would happen to the rest of the bulbs? What would happen if it was wired
in parallel?
10. What type of wiring (series/parallel) is our home, and how do we know?
11. Be able to work problems, such as:
a. A lamp is labeled 6V and has a resistance of 3ohms. What current flows through the
lamp when it is operating?
b. The current through an alarm clock connected to a 120V source is 2.08A. How
much power does the clock use? (hint: use P=IV)
c. A current of 3A flows through a resistor when it is connected to a 12V battery. What
is the resistance of the resistor?
d. A toaster has a resistance of 12 ohms when hot; what current will flow through it
when it is connected to 125V?
e. A 50V battery is connected in series to two lamps with resistances of 125 ohms and
225 ohms, respectively. Find the total resistance. Find the current in the circuit.
Find the potential difference across the 125 ohm lamp. Draw the schematic for this
circuit, and label the items with their numbers.
f. Two lamps are connected in parallel, one with a resistance of 12 ohms, and the other
with 18 ohms. What is the equivalent resistance of the parallel combination?
g. Three 35 ohm, 55 ohm, and 85 ohm resistors are connected in parallel. The three
resistors are then connected to a 35V battery. What is the equivalent resistance?
What is the current through each resistor? Draw this schematic.
h. A 110V household circuit that contains a 1800W microwave, a 1000W toaster, and
an 800W coffeemaker is connected to a 20A fuse. Will the fuse blow (melt) if the
microwave and the coffeemaker are on at the same time? How about if the toaster
and the coffeemaker is on at the same time? (Hint: use the equation P=IV to
determine the I for each device, then add them together to see if they exceed the
fuse’s rating)
12. Be able to look at and explain or draw a schematic. Include whether in series or parallel. Do
this one for practice.
15 ohms
30V