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WorksheetsLesson 3-4 Circuits & Electromagnetism
Total questions: 43
Worksheet time: 22mins
A simple circuit can be defined as a_______________.
scientific experiment that proves light bulbs can light
magnetic field that generates electricity
connected path that electricity can flow through.
battery-operated light switch
All simple circuits contain three things:
a power source, wires, and load
iron, metal and copper
density, mass and gravity
force, magnetism and electricity
Wires are a conductor that carries electrical energy from a source to an object transforming the energy. True or False?
True
False
A closed circuit is when everything is connected, allowing electricity to flow to a light bulb and turn on. True or False?
True
False
Which definition of an open circuit is the most accurate?
Electricity is possible because everything is connected, allowing the bulb to turn on
An object can become magnetized and create electromagnetic energy because everything is connected.
Something is missing, not touching, or not connected, which creates a break in the circuit -- NOT allowing electricity to the bulb, so it will NOT turn on.
When the switch is left open in a circuit, but electricity still is able to flow through the wires, allowing the light bulb to turn on.
A device that can open or close a circuit is called a ______.
alligator clip
battery
wire
switch
Electric current can be defined as the movement of magnetic energy. True or False?
True
False (it is when electrically charged particles move)
The positive side of a battery has positively charged particles. True or False?
True
False
The negative side of a battery has positively charged particles. True or False?
True
False (they have negatively charged particles)
A current flows through the ____ material that lights the bulb.
corrosive
conductive
magnetic
energetic
A light bulb transforms electrical energy into light energy. True or False?
True
False
The more energy or current from the source, the more light energy will be produced. True or False?
True
False
A series circuit can best be defined as when all ________________.
parts are connected in a single loop (one path for charges to follow)
parts are connected via multiple loops (several paths for charges to follow)
wires are connected directly to the light bulb and Voltmeter
batteries are connected to a switch via wires
Voltage is defined as the ______.
way a circuit performs when connected to a battery, switch, wires and light bulb
electrical potential energy difference between two places on a circuit.
energy level that a battery gives out
brightness of a light bulb when it is turned on
A parallel circuit has more than one load connected, side by side, allowing more than one path for electricity to travel. True or False?
True
False
Resistance can be scientifically defined as_____.
the density of an object impacted by its gravity
a negative charge being repelled by a positive charge
friction produced along the way between the current and the wires.
when energy decreases as acceleration increases
Standard U.S. voltage is ______.
120V
130V
140V
200V
Wires are usually made of _____ because they are the best conductors.
plastic
steel
iron
copper
A current is a stream of charged particles (electrons or ions) moving through _________.
a switch
an electrical conductor or space.
corrosive materials
the Earth
Resistance is measured in _____.
Ohms
Kilograms
Newtons
Seconds
Current is measured in _____.
Volts
Ohms
Amps
Kilograms
You can increase a current by _________.
decreasing the battery strength
decreasing the voltage across the wire
increasing the number of wires used
increasing the voltage across the wire
As you move away from the wire, the magnetic field becomes weaker. True or False?
True
False
Magnetic fields around current-carrying wires are weakest closest to the wires. True or False?
True
False (they are strongest closest to the wires)
The field around the wire becomes stronger as the ______ in the wire increases, or as more charged particles flow in the wire.
current
velocity
gravity
force
You can make a magnetic field stronger by adding coils in the wire. True or False?
True
False
When magnetic fields around the individual loops of the coil combine, it makes the magnetic fields stronger. True or False?
True
False
If the current is off, charged particles in the wire ____
move faster
stop moving
slow down
are not changed
The more wires running through a certain area increases the _______.
magnetic field surrounding the wires
velocity the energy travels
weight of the circuit
battery strength
Another way to increase the strength of a magnetic field occurs when _____
you add more gravitational pull to an object
you add a switch to the circuit
you add more wires
a magnetic material is placed within the coil
An electromagnetic can be defined as a ________________.
a new magnet created by additional battery force
temporary magnet made with a current-carrying wire coil wrapped around a magnetic core
temporary magnet made with plastic tubing connected to at least two batteries
magnet that is created when a circuit switch is closed
What 3 things do you need to make an electromagnet?
an open circuit with coiled wire, two light bulbs and a switch
a wire, a switch and a magnet
a closed circuit with an electricity source, a wire coil, and magnetic material inside the coil
two batteries, two wires and two regular magnets
Which of these three things are sources of electromagnets?
Weight, Mass, Force
Water, Plastic and Dirt
Desk, Pencil and Water bottle
Phone, Chromebook and Car
Why are electromagnets useful?
They don't weigh very much.
They become permanent magnets.
They are NOT useful at all.
They can be controlled in ways that other magnets cannot.
Which of the following are a way or ways that electromagnets can be controlled?
An electromagnet's magnetic field can be turned off and on.
all of these are correct
The strength of an electromagnet can be controlled by the number of loops insides the coil, and the amount of electric current in the coil
The North and South poles of the electromagnet reverse if the current reverses.
There are 3 main parts to a simple motor:
a drive shaft, a strong battery, and a source of energy
a coil of wire connected to a rotating shaft, a permanent magnet, and a source of electric energy, like a battery
an engine, an electromagnet and a switch
two batteries, a switch and a coil of wire connected to an electromagnet
In an electric motor _____ is transformed to ________ to produce motion.
metal/plastic coils
electric energy/mechanical energy
acceleration/force
battery strength/a switch
The strength of an electric motor depends on which of these 3 things:
acceleration, velocity and speed
where you hold it, how tight the wires are, and whether it weighs less than 1 gram
strength of the permanent magnet, the voltage, and the number of wire coils
whether it's made in the U.S., China, or another country
An electric generator is a device that ______________.
uses a battery to transfer power to a magnet, creating electric energy
uses a magnetic field to transfer potential energy into electric energy
uses a magnetic field to transfer mechanical energy to electric energy
uses a magnetic field to transfer potential energy into kinetic energy
An electric generator is a device that ______________.
uses a battery to transfer power to a magnet, creating electric energy
uses a magnetic field to transfer potential energy into electric energy
uses a magnetic field to transfer mechanical energy to electric energy
uses a magnetic field to transfer potential energy into kinetic energy
A direct current is an electric current that flows in multiple directions. True or False?
True
False (it flows only in one direction)
An alternating current is an electric current that changes direction in a regular pattern. True or False?
True
False (it changes direction in an irregular pattern)
Electromagnetism can be defined as the interaction between _______.
metal and plastic
electric charges and magnets
switches and lightbulbs
speed and velocity
