Unit 8: Electricity Review Worksheet
Vocabulary​
:
electric force
open/closed circuit
power
field force
internal circuit
charge
Due: 4/23/15
resistance
electrical potential
external circuit
ampere
voltage
circuit
current
load
static charge
1. I can explain what factors affect the strength of an electrical field.
The “Law of Electric Charges” says : Like charges ___________ each other. Unlike charges
_________ each other. A charged object will _____________ a neutral object.
A neutral object has the same number of_______ and _________. A positively charged object
has _____electrons than protons. A negatively charged object has ________ electrons than
protons.
Electric force is a vector because it has ___________ and _____________.
An electric field is defined as the direction that a ___________ charge will move in the field.
An electric field gets stronger as opposite charges are moved __________ OR as similar charges
are moved _____________.
Draw the electric field lines around each charge below. Check your notes!!
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2. I can describe how batteries are sources of voltage.
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Water Analogy: It takes e______ to pump water up into a water tower. The water gains
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p_________ e_______ because w_______ has been done on it. The water can
then f____ through the pipes.
Battery: A battery stores c_________ e________. It takes e________ to move charges from
one end of the battery to the other. The charges gain p_________ e_______ because
w_____ has been done on them. This creates a p_________ d__________ between
the ends of the battery. E__________ can then flow through the circuit.
3. I can explain how potential difference produces a current in a conductor.
Atoms contain _____________, ______________ and ________________. The only one of
these that can move is the _____________.
In a complete circuit, electrons flow from the __________ end of the battery to the
_________ end of the battery.
4. I can distinguish between conductors, superconductors, semiconductors, insulators.
Type of Substance
Definition
Examples
conductor
insulator
superconductor
semi-conductor
5. I can describe the relationship between resistance, current and voltage.
If voltage is kept constant, as resistance increases, then current ___________.
If resistance is kept constant, as voltage decreases, then current ___________.
If you unscrew a light bulb what happens in a:
parallel circuit?____________________
series circuit?_________________________
If you add light bulbs to the circuit what happens to the volts in a:
parallel circuit?____________________
series circuit?_________________________
If you add light bulbs to the circuit what happens to the current in a:
parallel circuit?____________________
series circuit?_________________________
6. I can identify the units for charge, current, resistance, voltage.
Quantity
Definition
Units​
(Symbol)
charge
__________(____)
current
__________(____)
resistance
__________(____)
voltage
__________(____)
7. I can draw and interpret schematic diagrams of series and parallel circuits.
To the right is a typical electric circuit.
Label the parts of the circuit.
Below are four circuits. Label each one as series or parallel or both.
Below is a circuit with four bulbs in it.
a) Place four switches in the circuit so each switch only controls one light bulb. Label each
switch with the letter of the bulb it controls.
b) Insert a switch that will turn off only three bulbs. Label it E
c) Insert a switch that will turn off all the bulbs. Label it F
​or each of the following circuits, explain
F
which, if any, of the bulbs will light. If the
bulbs don't light, change the circuit so that it
will.
For each of the circuits below, draw a continuous conducting path (if possible) with direction
through the circuit and indicate which bulbs will be lit.
8. I can explain how fuses and circuit breakers are used to prevent circuit overload.
Three examples of a “load” are ______________, ________________ and _______________
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Each load tranforms electrical energy into ___________, ____________ or ____________.
A fuse contains a piece of m________ which has a higher r___________ than the rest of the
circuit. If the current gets too h________ , the fuse will m________. This b________ the
circuit so that the current s___________ , protecting you from harm.