What is a resistance?

What is a resistance?

Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω). Ohms are named after Georg Simon Ohm (1784-1854), a German physicist who studied the relationship between voltage, current and resistance.

What causes resistance?

An electric current flows when electrons move through a conductor, such as a metal 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.

What are 4 factors that affect resistance?

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 happen to the current as the resistance increases?

In other words, the current is directly proportional to the voltage and inversely proportional to the resistance. Alternately, if the resistance in a circuit is increased and the voltage does not change, the current will decrease.

Why is resistance directly proportional to length?

For a given material, resistance and length formula clearly speaks that the resistance is directly proportional to its length. When the length of the material is increased, its value of resistance also increases. When the length of the material decreases, its value of resistance will also decrease.

What is the relation between area and resistance?

Resistance depends on an object’s size, shape, and material. In Figure 3 below, the cylinder’s resistance is directly proportional to its length l. The longer the cylinder, the higher the resistance. Additionally, the resistance is inversely proportional to the cross sectional area A.

Is length directly proportional to resistance?

The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area. The resistance of a conductor, or circuit element, generally increases with increasing temperature.

What happens to the resistance if the length is doubled?

What happens to resistance when length is doubled? From the equation, we understand that resistance is directly proportional to the length of the conductor and inversely proportional to the crossectional area of the conductor. Doubling the length doubles the resistance.

How will the resistance and resistivity of a wire change if its length is doubled?

(d) Resistivity of wire remains constant. As the length of wire gets doubled, the cross-sectional area will become half of its previous value because volume of wire remains constant. Hence, we can see that the new resistance is four times the previous resistance.

On what factor does the resistance depends on?

The resistance of a conductor depends on the cross sectional area of the conductor, the length of the conductor, and its resistivity. It is important to note that electrical conductivity and resistivity are inversely proportional, meaning that the more conductive something is the less resistive it is.

What is the resistance between A and B in the following network?

The answer is 2 ohm.

How do you find the resistance between points A and B?

The two resistances R1 and R2 of 4 ohms are in series therefore their equivalent resistance,

1. R’ = 4 Ω + 4 Ω = 8 Ω
2. Now the resistances R’, R3 and R4 are in parallel so the equivalent resistance of the circuit would be.
3. Therefore the equivalent resistance between the two points A and B in the given circuit is 1.85 Ω.

What is the resistance from A to B?

In simpler terms : Voltage remains same until a resistance comes in it’s way ! Here also same, So basically those three resistances are parralel to each other between A and B, Since all are same and 3 are present Equivalent resistance is R/3 !!

What is the equivalent resistance between points A and B 2 points?

Answer. Rt=2+2+1=5 ohm.

What is the equivalent resistance between A and B in the figure?

Hence, the value of the resistance in the circuit between A and B is 3 ohms.

How do you find the resistance of an infinite network?

1. (R+X)X=2R2+2RX+RX.
2. RX+X2=2R2+2RX+RX.
3. X2−2RX−2R2=0.

What is the equivalent resistance between points A and B * 1 point Captionless image?

Thus eqvivalent resistance between A and B is 8Ω .

What does infinite resistance mean?

When you see the infinite resistance on a digital multimeter, it means that there is no electrical current flowing through the component you’re measuring. Resistance is measured in ohms with no current flowing through the circuit. It indicates zero ohms when there is no resistance between the test points.

What does zero ohms mean?

Ohms is a measurement of resistance so “zero ohms” means no resistance. All conductors offer some resistance, so technically, there is no such thing as zero ohms.