Grade 9 Academic Electricity Review

11.1 Static Electricity – 12.1 Current Electricity 13.1 Parallel and Series
charged objects, law of electric Circuits
charges 12.2 Part of a Circuit
13.3 Electrical Current (I)
11.2 Charging by Contact and 12.3 Types of Electrical Energy
Friction – electrostatic series, Cells 13.5 Potential Difference (V)
grounding
12.4 Forms of Current AC /DC 13.7 Resistance [R]
11.4 Conductors and
Insulators 12.5 Forms of Renewable and 13.9 Ohm’s Law[V = I x R]
non-renewable Energy
11.6 Charging by Induction 13.10 Comparing Series and
12.7 Efficiency Parallel Circuits
11.8 Electric Discharge –
Lightning

Completion

1 ____________________ and neutrons are found in the nucleus of an atom.

2 ____________________ can be easily added or removed from an atom.

3 A form of charge, either positive or negative, that exerts an electric force is called a(n) ____________________.

4 An atom that has an electric charge is called a(n) ____________________.

5 A(n) ____________________ object is an object that has equal numbers of protons and electrons.

6 A(n) ____________________ charged object is an object that has more electrons than protons.

7 A(n) ____________________ charged object is an object that has fewer electrons than protons.

8 ____________________ is an imbalance of electric charge on the surface of an object.

9 Charging by ____________________ occurs when two different neutral materials are rubbed together or come in
contact and electric charges are transferred from one object to the other.

10 ____________________ electricity refers to electric charges that flow through a conductor in a controlled way.

11 A continuous path for electron flow is called an electric ____________________.

12 The part of an electrical circuit that converts electrical energy into other forms of energy is called the
____________________.

13 An electric ____________________ is a portable device that converts chemical energy into electrical energy.

14 ____________________ cells are electric cells that cannot be recharged because the chemical reactions that produce
the flow of electrons are not reversible.

15 ____________________ is a measure of how much useful energy an electrical device produces compared with the
amount of energy that was supplied to the device.

16 ____________________ cells are electric cells that can be recharged and reused many times before they are recycled.

17 A flow of electrons in one direction through an electric circuit is called ____________________ current.

18 A flow of electrons that move back and forth in an electric circuit is called a(n) ____________________ current.

19 A natural energy resource that is unlimited is called a(n) ____________________ resource.

20 A circuit ____________________ is a standard way of drawing an electrical circuit.

21 A measure of the rate of electron flow past a given point in a circuit is called electric ____________________.

22 Electric current is measured in ____________________.

23 A device used to measure electric current is called a(n) ____________________.

 24 Electrical ____________________ is the opposition to the movement of electrons as they flow through a circuit.

25 A device used to measure resistance is called a(n) ____________________.

26 A device used to measure potential difference is called a(n) ____________________.

27 For any electrical device to operate, there must be a flow of ____________________.

28 Electrical resistance is measured in ____________________.

29 An ammeter must be connected in ____________________ with a load to measure the current flowing through the
load.

30 As you increase the length of a wire, its internal resistance ____________________.

31 The difference in electric potential energy per unit of charge measured at two points is called
____________________.

32. A circuit has potential difference of 9 V and a total resistance of 18 Ω’s. Calculate the current in the circuit.

33. A circuit has a total resistance of 8 Ω’s and a current of .05A’s. Calculate the potential difference.

34. A circuit has potential difference of 9 V and a current of .2A’s. Calculate the resistance.

35. A circuit has a potential difference of 9V. Light bulbs are added in series with a resistance of 2 Ω’s each. Calculate the current in
each of the three cells starting with one bulb. Additionally, calculate the voltage at each bulb for each circuit.

36. Draw the following circuits:

Three batteries connected to 2 bulbs wired in series Two batteries connected to 3 bulbs in series with a
with an ammeter and a voltmeter. closed switch and a voltmeter.

Three bulbs wired in series with an open switch Four bulbs wired in parallel with two closed
connected to a three cell battery. switches connected to a one cell battery.

37. Label the following circuits

 1 Protons
2 Electrons
3 electric charge
4 ion
5 neutral
6 negatively
7 positively
8 Static electricity
9 friction
10 Current
11 circuit
12 load
13 cell
14 Primary
15 Efficiency
16 Secondary
17 direct
18 alternating
19 renewable
20 diagram
21 current
22 amperes
23 ammeter
24 resistance
25 ohmmeter
26 voltmeter
27 electrons
28 ohms
29 series
30 increases
31 voltage