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Physics

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Alexandre Ferry

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βˆ™ 2021-10-15 18:34:48
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Cards in this guide (21)
2001 toyoto blows fuse when you go in reverse

Not enough information. WHICH fuse blows out???

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

What is a closed path through which a current can flow

A closed path through which a current can flow is called a circuit.

Electric Circuit:)

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.

What will increase if the voltage in a circuit is increased

Heat produced by the circuit, current

One of the differences between electric and magnetic fields is that electric field lines always form closed loops

True βœ…

In terms of the scientific definition of work neither magnetic fields nor electric fields can do work

True

Choose the best description of a magnetic field line

A magnetic field line shows the direction a compass needle would point.

A spinning coil of wire is what moves the cone in a speaker producing the sound

False

A material that prevents electrons from flowing freely is called what

an insulator

In a parallel circuit the is the same for every leg in the circuit

voltage

A portable electric heater has a resistance of 8 ohms It plugs into a wall outlet that is 120 V How much current in amps does it draw

15

An electric clothes dryer draws 22 A of current from a 240-V wall outlet How much power in watts does it use

Power (Watts) = Current (Amps) * Voltage

Power = 22Amps * 240 Volts

Power = 5,280 Watts

5280

Increase the strength of a copper electromagnet

There are a couple of ways to increase the strength of a copper electromagnet. You could increase the current going through the wire or wrap more wire around it which increases the strength exponentially. You could also put in a soft iron core such as a nail which in essence becomes a magnet and increases the strength of the magnet.

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.

A desktop computer and monitor together draw about 2 A of current They plug into a wall outlet that is 120 V What is the resistance in ohms of the computer-monitor combination

200βœ…

If an electric clothes dryer has a resistance of 8 ohms and it draws 30amps of current what is the voltage in volts of the wall outlet that it is plugged into

240

Which of the following is true about the force between charges

Like charges repel each others.

The force between charges decreases as the distance between them increases.

Is an atom that has the same number of protons as neutrons a neutral atom

False. The atom that has the same number of protons as it has electrons is a neutral atom.

Which of the following is a source of direct electric current

Batteries

Which of the following would be best to do of you were inside a car and a power line fell on the car

wait for someone from the power company to come ant help - APEX;0

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