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WorksheetsElectricity & Magnetism Homework
Total questions: 40
Worksheet time: 55mins
What is electricity?
The energy produced when an object vibrates
The energy stored in the bonds of chemical bonds
The energy produced by electrons
The energy of Motion
The flow of electrical energy is called a(n)
parallel circuit
electron
current
series circuit
Electricity cannot flow through porcelain. Porcelain is therefore a(n)
conductor
insulator
electron
conductor and insulator
The voltage in a series circuit is 180V, and the resistance is 2.2Ω
What is the current flow in the circuit?
82A
396A
0.012A
3.96A
An air conditioner used 1800W of power.
The voltage source is 120V.
How much current is flowing through the air conditioner?
216,000A
15.0A
0.0570A
A short circuit
A radio requires 0.25A of current when operated on a 120V source.
How much power is used by the radio?
0.00208w
480w
30w
Suppose that you connect 3 components in Series. They have resistances of 112 ohms, 470 ohms, and 680 ohms, as shown. What is the total resistance of the series combination?
35,000Ω
1262Ω
0.0125Ω
Is the following sentence True or False?
If a neutral atom gains one or more electrons, it becomes a positively charged ion
True
False
A charge transfer between objects that touch each other is called
induction
conduction
friction
Is the following sentence True or False?
According to Ohm’s law, the voltage in a circuit equals the Current divided by Resistance.
True
False
The flow of electrons through a wire or any conductor
Ohms (Ω)
Amperage (A)
Voltage (V)
Watts (W)
Which of the following is true of all magnets?
They are man-made
They are made of iron
They have two poles and a magnet field
They are magnetic only when an electric charge goes through them
If you have two magnets and you try to put the two north poles together, what will most likely happen?
The two poles will not touch each other because of magnetic repulsion
The magnets will stick together because of magnetic attraction
The two poles will touch but not stick together
The magnets will lose their magnetism
Where is the field of a magnet strongest?
near the north pole only
near the south pole only
both poles
near the middle
Current is measured in
Ohms (Ω)
Amperage (A)
Voltage (V)
Watts (W)
Resistance is measured in
Ohms (Ω)
Amperage (A)
Voltage (V)
Watts (W)
The flow of electrons through a wire or any conductor
Ohms (Ω)
Amperage (A)
Voltage (V)
Watts (W)
Ferromagnetic material is
Always a magnet
A magnet if its domains are aligned
A magnet if its domains are not aligned
never a magnet
An electric generator converts
electrical energy into mechanical energy
power into energy
energy into power
mechanical energy into electrical energy
A galvanometer is a device used to measure
current
resistance
voltage
magnetic strength
A transformer increases or decreases
energy
resistance
voltage
direct current
What causes a ferromagnetic material to become magnetic?
unpaired electrons
unpaired protons
paired electrons
paired protons
The image below depicts
static electricity
the flow of electrons
a magnetic field
forces of attraction
An electroscope is a device that indicates when...
objects are negatively charged – only
objects are positively charged – only
objects have a neutral charge
when objects have a charge
Determine Resistance.
V = 24v
I = 0.25A
6Ω
96Ω
0.014Ω
9.6Ω
Determine Voltage.
R = 645Ω
I = 90A
7.16v
58,050v
0.139v
Determine Current.
R = 65Ω
V = 12,025v
185A
781,625A
0.0054A
18.5A
Which particles move freely through metals, speeding the transfer of thermal energy?
atoms
electrons
protons
molecules
An atom is electrically neutral
Only if it has no electrons
If it has the same number of protons and neutrons
If has the same number of protons and electrons
If it is a cation or an anion
Which of these forces works only by combining electric and magnetic forces?
Magnetic
Electric
Electromagnetism
This force occurs when there is an attractive and repulsive force between two poles.
Magnetic
Electric
Electromagnetism
In a magnet the opposite poles will ___________.
attract
repel
Which of the following is NOT true with respect to the Earth's North Pole?
Magnetic north is the center most northern point on the planet
A compass directs you to the magnetic north
The Earth is on big magnet
The north and south are directly south opposite one another
A coil of current carrying wire that produces a magnetic field
Conductor
Insulator
Solenoid
Generator
Of the two types of generators, which one has a currently that is constantly changing direction; produced by most generators and used primarily in commercial use?
Direct Current (DC)
Alternating Current (AC)
Of the two types of generators, which one has current that flows in one direction?
Direct Current (DC)
Alternating Current (AC)
How could the strength of an electromagnet be increased?
a.by reducing the length of the core of the electromagnet
a.by using rubber material as the core for the electromagnet
a.by decreasing the amount of current in the electromagnet
a.by increasing the number of coils in the wires of the electromagnet
True or False.
Temporary magnets lose their magnetic charges soon after they are separated from a magnet
True
False
If you cut a magnet in half, you have
No magnets
two half magnets
one magnet
two magnets
