Download Electricity Unit Review

Unit D Final Exam Review
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Reference: read pages 274 – 365 in Science in Action 9 text.
What is static electricity?
3 Laws of Electrical Charges
a.
b.
c.
Draw a series of diagrams to explain charge separation.
Rubbing vinyl strip with wool creates a
charge
Rubbing acetate strip with cotton creates a
charge
What is current electricity?
2 Conditions in Order for Electrical Current to Flow
a.
b.
Complete the following chart:
Units
Symbol
Voltage:
Current:
Resistance:
Power:
Energy
What is the difference between a conductor and an insulator?
Diagram of a conductor and insulator (see page 298)
Formula
Read Electrical Safety Pointers on page 285.
Compare and contrast fuses and circuit breakers.
What is an electrochemical cell?
Define
Electrolyte:
Electrode:
What is the difference between a dry cell and a wet cell?
Draw a neat diagram in pencil of a wet cell. Be sure to label all parts.
Explain the difference between a primary cell and a secondary cell.
What is electrochemistry?
5 Applications of Electrochemistry
1.
2.
3.
4.
5.
What is a superconductor?
What is a rheostat?
Ohm’s Law states that as long as temperature remains constant:
a.
b.
As temperature
, resistance
A bulb has 12 Ω of resistance in a circuit operated by two 1.5 V cells hooked in series. Calculate
the current in the circuit.
A tea kettle draws 8 A of current from a 120 V outlet. What is the resistance of the element?
Draw a schematic diagram that would have three 1.5 V cells hooked in series and would operate
a light and a motor separately. There would also be a master switch to shut everything off.
What are the four common forms of energy?
a.
b.
c.
d.
What is a thermocouple?
Label the St Louis Motor.
terminals, commutator, brushes, armature, permanent magnet, connecting wire
What is the difference between alternating and direct current?
What are the two types of transformers? Draw a diagram of each.
a.
diagram
b.
diagram
An electric fan uses 1140 W of power and has a current of 9.5 A. What is the voltage of the
system?
A hair dryer uses 980 W of power when plugged into a 120 V outlet. Calculate the resistance of
the element in the hair dryer. (hint: you need to use more than one formula THINK about it!!))
A stove has a power rating of 850 W. If you bake a cake for 25 minutes at 350oC, how much will
you be charged if the power company charge $0.15 per kWh?
Why are systems not 100% efficient? What happens to this “wasted” energy?
What is the difference between a renewable and nonrenewable resource?
What is flyash?
Use the term sustainable or sustainability in a sentence to demonstrate understanding of the
term.
Which of the following diagrams represents an electric drill that can adjust the speed of the motor
and turn it on and off?