What are two ways to increase the resistance in a wire?

What are two ways to increase the resistance in a wire?

length – longer wires have greater resistance. thickness – smaller diameter wires have greater resistance. temperature – heating a wire increases its resistance.

What are three ways to decrease resistance in a wire?

Changing the material, increasing the cross section area, lowering the temperature, and using a thicker wire are some of the ways to reduce resistance.

How can resistance in a wire be reduced?

Of course there exist many different ways to reduce the resistance, such as using a thicker wire (increase the cross section area), lowering the temperature, or even changing the material.

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 causes high resistance in a wire?

The moving electrons can collide with the ions in the metal. This makes it more difficult for the current to flow, and causes 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.

How much is too much resistance in a wire?

resistance of wiring should ideally be zero. the DMM puts out so little current that even a wire with every strand but one broken should read close to zero. maybe one or two tenths of an ohm, tops. as stated, bending should not matter.

What is considered high resistance in a wire?

Typically, good wire connections have a resistance of less than 10 Ω (often only a fraction of an ohm), and isolated conductors offer a resistance of 1 MΩ or greater (typically tens of megohms, depending on humidity).

What happens to resistance as the length of a wire increases?

when you have longer length of wire, the current has to travel more distance, more the distance higher the number of obstacles it faces through its path. Therefore resistance increases with the length. When cross sectional area increases the space of the elctrons to travel increases(simply explained).

What are the factors affecting resistance and resistivity?

The resistivity (ρ) of the material from which the conductor is made. The total length (L) of the conductor. The cross-sectional area (A) of the conductor. The temperature of the conductor.

What causes low resistance in a circuit?

All conductors give off some degree of heat, so overheating is an issue often associated with resistance. The lower the resistance, the higher the current flow. Possible causes: insulators damaged by moisture or overheating.

Why does resistance change as voltage increases?

As the voltage across a resistor increases, the power dissipated by the resistor also increases. As power increases, the temperature of the resistor also increases. As the temperature of the resistor increases, its resistance will change.

How do you reduce voltage and maintain current?

V=IR so to maintain a constant voltage while decreasing current you simply have to increase resistance by the same amount you have decreased your current. If you decrease the current by half then you will need to double your resistance.

How do you control current in a circuit?

The current in a circuit is directly proportional to the electric potential difference impressed across the circuit and inversely proportional to the resistance of the circuit. Reducing the current can be done by reducing the voltage (choice A) or by increasing the resistance (choice D). 2.

What is constant current charging method?

Constant current is a simple form of charging batteries, with the current level set at approximately 10% of the maximum battery rating. Charge times are relatively long with the disadvantage that the battery may overheat if it is over-charged, leading to premature battery replacement.

When two batteries are connected in parallel it should be ensured that?

When two batteries are connected in parallel, it should be ensured that. they have same e.m.f. they have same e.m.f.

What is pulse charging method?

Pulse charging methods has been developed as one of the fast charging methods for Lithium ion battery. This technique applies the continuous constant current pulse with certain pulse width until the battery fully charged. The similar degradation patterns on battery capacity were observed.