What is the resistance in ohms of the computer-monitor combination when a desktop computer and monitor together draw about 1.2 A of current and they plug into a wall outlet that is 120 V
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Definition1/13
60
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Term1/13
Which is true of magnetic field lines but not electric field lines
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Definition1/13
they show wich way iron shavings would align themselves
They always make closed loops.
Electric field lines can either form closed loops or they can
start and finish on isolated electric charges. Magnetic field lines
always only form closed loops.
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Term1/13
When a fuse blows
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Definition1/13
When a fuse blows, you should replace the fuse and check to see
what might have caused it to blow. It's a sign that there might be
something causing too much current to flow in the circuit.
🔄 Click to see term
Term1/13
Do electric and magnetic fields always form closed loops
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Definition1/13
Magnetic fields do, because there's no such thing as an isolated
magnetic "pole",
and a magnetic line always starts and ends at opposite poles of
the same
magnetized object.
But electric fields don't. You can easily have a bundle of
isolated positive charge
over here and a bundle of isolated negative charge over there,
whereupon the
lines of the electric field start on one bundle and end on the
other bundle.
But electric field lines can also exist in closed loops, and
they do that in radio waves, where the electromagnetic field
propagates with an electric field component and a magnetic field
component, and they both form closed loops.
🔄 Click to see term
Term1/13
Atoms are composed of protons and electrons
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Definition1/13
Atoms are made of different numbers of protons, neutrons, and
electrons. Protons (positive charge) and Neutrons (neutral charge)
make up the nucleus of the atom. The incredibly small electrons
(negative charge) follow orbitals around the nucleus in what's
known as an Electron Cloud.
An example where this is not true, however, is a hydrogen atom.
It has only one proton and one electron. Because it only has one
proton, it does not naturally have any neutrons as no buffer is
needed between protons.
🔄 Click to see term
Term1/13
In a parallel circuit the is the same for every leg in the circuit
🔄 Click to see definition
Definition1/13
voltage
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Term1/13
Electric fences are not connected to the ground in the circuit
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Definition1/13
A short answer:
An electric fence is connected to the ground only when an animal or a human being touches it to complete a circuit from the fence to the ground.
A longer answer:
The wires of an electric fence are not connected directly to the ground because, if that was done, the fence would be shorted out and would not be able to do its job!
This is how an electric fence is actually hooked-up: the electric fence is connected to one side of a specially designed high voltage source and the return side of that source is connected to the ground.
Then, whenever the skin of any animal - or human - touches the wire whilst standing on the ground in bare feet, they get a high-voltage (10,000) DC electric pulse from the electric fence. The shocks are designed to be only enough to make them jump back from the fence, not to "electrocute" them so badly as to cause serious injury or death.
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Term1/13
When none of the magnetic domains in a material will stay aligned the material is called
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Definition1/13
not magentic
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Term1/13
In a closed circuit what does an increase in voltage cause
🔄 Click to see definition
Definition1/13
an increase in current, hence increased power and increased
heat.
🔄 Click to see term
Term1/13
What are likely to be affected by a magnet
🔄 Click to see definition
Definition1/13
Credit card, an access card you scan for entry into a building
!
🔄 Click to see term
Term1/13
Where would shock from an electrified fence be the least unpleasant if standing A barefoot on wet grass during rain B on a rubber mat or very dry ground C on a metal ladder against the fence
🔄 Click to see definition
Definition1/13
You would need to be standing on some kind of electrical
insulator, such as a rubber mat, or on very dry ground.
🔄 Click to see term
Term1/13
What will be attracted to or repelled by an magnet
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Definition1/13
a copper wire carrying current and another magnet.
🔄 Click to see term
Term1/13
What do protons and electrons have that neutrons do not
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Definition1/13
Protons and electrons both have a positive or negative charge,
but neutrons have no charge.
🔄 Click to see term
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Cards in this guide (13)
What is the resistance in ohms of the computer-monitor combination when a desktop computer and monitor together draw about 1.2 A of current and they plug into a wall outlet that is 120 V
60
Which is true of magnetic field lines but not electric field lines
they show wich way iron shavings would align themselves
They always make closed loops.
Electric field lines can either form closed loops or they can
start and finish on isolated electric charges. Magnetic field lines
always only form closed loops.
When a fuse blows
When a fuse blows, you should replace the fuse and check to see
what might have caused it to blow. It's a sign that there might be
something causing too much current to flow in the circuit.
Do electric and magnetic fields always form closed loops
Magnetic fields do, because there's no such thing as an isolated
magnetic "pole",
and a magnetic line always starts and ends at opposite poles of
the same
magnetized object.
But electric fields don't. You can easily have a bundle of
isolated positive charge
over here and a bundle of isolated negative charge over there,
whereupon the
lines of the electric field start on one bundle and end on the
other bundle.
But electric field lines can also exist in closed loops, and
they do that in radio waves, where the electromagnetic field
propagates with an electric field component and a magnetic field
component, and they both form closed loops.
Atoms are composed of protons and electrons
Atoms are made of different numbers of protons, neutrons, and
electrons. Protons (positive charge) and Neutrons (neutral charge)
make up the nucleus of the atom. The incredibly small electrons
(negative charge) follow orbitals around the nucleus in what's
known as an Electron Cloud.
An example where this is not true, however, is a hydrogen atom.
It has only one proton and one electron. Because it only has one
proton, it does not naturally have any neutrons as no buffer is
needed between protons.
In a parallel circuit the is the same for every leg in the circuit
voltage
Electric fences are not connected to the ground in the circuit
A short answer:
An electric fence is connected to the ground only when an animal or a human being touches it to complete a circuit from the fence to the ground.
A longer answer:
The wires of an electric fence are not connected directly to the ground because, if that was done, the fence would be shorted out and would not be able to do its job!
This is how an electric fence is actually hooked-up: the electric fence is connected to one side of a specially designed high voltage source and the return side of that source is connected to the ground.
Then, whenever the skin of any animal - or human - touches the wire whilst standing on the ground in bare feet, they get a high-voltage (10,000) DC electric pulse from the electric fence. The shocks are designed to be only enough to make them jump back from the fence, not to "electrocute" them so badly as to cause serious injury or death.
When none of the magnetic domains in a material will stay aligned the material is called
not magentic
In a closed circuit what does an increase in voltage cause
an increase in current, hence increased power and increased
heat.
What are likely to be affected by a magnet
Credit card, an access card you scan for entry into a building
!
Where would shock from an electrified fence be the least unpleasant if standing A barefoot on wet grass during rain B on a rubber mat or very dry ground C on a metal ladder against the fence
You would need to be standing on some kind of electrical
insulator, such as a rubber mat, or on very dry ground.
What will be attracted to or repelled by an magnet
a copper wire carrying current and another magnet.
What do protons and electrons have that neutrons do not
Protons and electrons both have a positive or negative charge,
but neutrons have no charge.
What is the resistance in ohms of the computer-monitor combination when a desktop computer and monitor together draw about 1.2 A of current and they plug into a wall outlet that is 120 V
Which is true of magnetic field lines but not electric field lines
When a fuse blows
Do electric and magnetic fields always form closed loops
What is the resistance in ohms of the computer-monitor combination when a desktop computer and monitor together draw about 1.2 A of current and they plug into a wall outlet that is 120 V
An electric clothes dryer has a resistance of 16 ohms It draws 15 A of current What is the voltage in volts of the wall outlet that it is plugged into
Do electric and magnetic fields always form closed loops
In terms of the scientific definition of work neither magnetic fields nor electric fields can do work
What is the resistance in ohms of the computer-monitor combination when a desktop computer and monitor together draw about 1.2 A of current and they plug into a wall outlet that is 120 V
Which is true of magnetic field lines but not electric field lines
Do electric and magnetic fields always form closed loops
In a parallel circuit the is the same for every leg in the circuit
What is the resistance in ohms of the computer-monitor combination when a desktop computer and monitor together draw about 1.2 A of current and they plug into a wall outlet that is 120 V
What are the substances that increase the rate of a chemical reaction called
Do electric and magnetic fields always form closed loops
In a parallel circuit the is the same for every leg in the circuit
What is the resistance in ohms of the computer-monitor combination when a desktop computer and monitor together draw about 1.2 A of current and they plug into a wall outlet that is 120 V
What are the substances that increase the rate of a chemical reaction called
An electric clothes dryer has a resistance of 16 ohms It draws 15 A of current What is the voltage in volts of the wall outlet that it is plugged into
Do electric and magnetic fields always form closed loops