What is required for an electric charge to flow through wire?

Answer: To produce an electric current, three things are needed: a supply of electric charges (electrons) which are free to flow, some form of push to move the charges through the circuit and a pathway to carry the charges. The pathway to carry the charges is usually a copper wire.

Which wire when current flows through it would be surrounded by the strongest magnetic field?

Answer: The strongest magnetic field is in (c) . When the no of turns around a wire increases, the associated electric field increase. Hence, the magnetic field will be strongest.

What happens when you disconnect the power to an electromagnet?

If you disconnect the wire, the magnetic field disappears and the nail is no longer a magnet. If you leave the wire connected long enough, the nail’s magnetic domains will realign enough to make it a permanent magnet.

Which statement describes the relationship between electric generators and electric motors?

Generators transform mechanical energy into electrical energy whereas electric motors transform electric energy into mechanical energy.

What is required for an electric charge to flow through a wire quizlet?

A difference in electrical potential is needed for charge to flow. The flow of charge persists as long as there is potential difference ; without a potential difference, or once both ends reach an equilibrium, flow ceases.

What term is used for electricity at rest?

Electrostatics

Why is dust attracted to a DVD wiped with a dry cloth?

Why is dust attracted to a DVD wiped with a dry cloth? During the wiping process either electrons are transferred to the cloth from the CD or from the CD to the cloth. The charge produces an electric field which polarizes dust particles near it and the polarized dust particles are then attracted to the charged CD.

Why is there no electric field at the center of a charged spherical metal ball?

Distribution of electric charge is not perfectly even. Because of mutual repulsion, mobile electrons in the conductor will spread out uniformly over the outer surface of the ball, so the force and the field on a test charge at the center is zero because opposing forces balance in every direction.

How much energy is supplied to each Coulomb of charge that flows through a 12 V battery?

A 12-volt battery provides 12 Joules of energy for every 1 Coulomb of charge which it moves from the low energy location to the high energy location. As such, the voltage rating of a battery simply describes the energy change of every coulomb of charge which is moved between terminals.

Does heating a metal wire increase or decrease its electrical resistance?

Heating a metal wire increases electrical resistance. If the resistance of a circuit remains constant while the voltage across the circuit decreases to half its former value, what change occurs in the current? resistance decreases.

Does current flow across or through a circuit?

Current is the rate at which charge flows. Charge will not flow in a circuit unless there is an energy source capable of creating an electric potential difference and unless there is a closed conducting loop through which the charge can move. 2. Current has a direction.

How many joules per Coulomb are given to charges that flow in a 120 volt circuit?

120 Joules

Why is it that a bird can perch without harm on a high voltage wire?

A bird can perch without harm on a high voltage wire because both of its feet are at the same potential. If there is no potential difference between two points, no current will flow. This means that a large current could flow – through you.

How do I calculate resistance?

If you know the total current and the voltage across the whole circuit, you can find the total resistance using Ohm’s Law: R = V / I. For example, a parallel circuit has a voltage of 9 volts and total current of 3 amps. The total resistance RT = 9 volts / 3 amps = 3 Ω.

Will water flow more easily through wide or narrow pipe?

Will water flow more easily through a wide pipe or a narrow pipe? Will current flow more easily through a thick wire or a thin wire? Water will flow more easily through a wide pipe.

Will current flow more easily through a thick wire or a thin wire?

The current will flow more easily through the thick wire than the thin wire. It is because the resistance of a conductor is inversely proportional to its area of cross-section. If thicker the wire, less is resistance and hence more easily the current flows.

How does wetness affect the resistance of your body?

How does wetness affect the resistance of your body? It decreases the resistance of your body. The difference in elecrtical potential between one part of your body and another part when touching a current, it will pass along the path of least electrical resistance between two points.

How does the current change if you increase the resistance keeping the voltage difference the same?

How does the current change if you increase the resistance, keeping the voltage difference the same? The current increases.

What happens to the current when you increase the voltage?

Voltage, Current and Resistance Summary The relationship between Voltage, Current and Resistance forms the basis of Ohm’s law. In a linear circuit of fixed resistance, if we increase the voltage, the current goes up, and similarly, if we decrease the voltage, the current goes down.

Which situation will have the highest resistance?

the answer is C . long wire and cold temperature, increase the resistance.

What kind of wire would have the least resistance?

thick wire

Which copper wire would have the highest resistance?

So flowing water through a small pipe for a long distance will inversly affect the normal flow where as flowing water through a big pipe for a small distance will not affect too much the normal flow. So long & thin wire has high resistance. Short & thick wire has low resistance.

What are the four things that affect the resistance of a wire?

There are 4 different factors which affect resistance:

• The type of material of which the resistor is made.
• The length of the resistor.
• The thickness of the resistor.
• The temperature of the conductor.

What does not affect a material’s resistance?

Length and area affect resistance as well as type of material expressed with . Temperature does not affect resistance.

Does length of wire affect resistance?

The resistance of a long wire is greater than the resistance of a short wire because electrons collide with more ions as they pass through. The relationship between resistance and wire length is proportional .

What does not change the resistance of a wire?

Answer on Question #45708, Physics, Electromagnetism The only item not listed here is voltage. Voltage value is not affect resistance (if we will not take into account any temperature changes).

Why does the resistance of a wire depend on its length?

Resistance of a wire is directly proportional to the length of the wire. The resistance of a conductor depends on the number of collisions which the electrons suffer with the fixed positive ions while moving from one end to the other end of the conductor. Therefore, a longer conductor offers more resistance.

How does the resistance of a wire depend on its length experiment?

From the graph it can be seen that the longer the piece of wire, the higher the resistance. Resistance is directly proportional to length as the graph gives a straight line through the origin.