How do you calculate the length of a wire?
To calculate spring wire length per coil, you must subtract the wire diameter from the outer diameter in order to get mean diameter. Once you have calculated mean diameter, multiply it by pi (3.14); this will give you the length of wire per coil.
How do you find the resistance of a wire with diameter?
Strategy. We can rearrange the equation R=ρLA R = ρ L A to find the cross-sectional area A of the filament from the given information. Then its diameter can be found by assuming it has a circular cross-section.
What is the resistance of a 100 m length of round copper wire with a radius of 0.3 mm?
What is the resistance of a 100m length of round copper wire with a radius of 0.3mm? ρ copper=1.724×10−8Ωm.
Does the length of a 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 will happen to the resistance and current if the length of the Nichrome wire is increased in the circuit?
This is because with the increase in length, resistance of the circuit increases, hence current decreases.
How is the resistance of a wire affected if its length is doubled its radius is doubled?
(a) Resistance of a wire is directly proportional to the length of a wire; so if the length is doubled, resistance is also doubled. (b) Resistance of a wire is inversely proportional to the area of cross-section the wire. Thus, if radius is doubled, area increases four times and hence the resistance becomes one-fourth.
What happens to the resistance when the diameter is doubled?
When diameter is doubled, the resistance becomes R′=π(2d/2)2ρL=R/4.
When the resistance of a wire is tripled and current is doubled then heat produced will be?
Heat produced is directly proportional to the square of current. If current I is doubled, heat H will be four times.
How much heat is produced if current is doubled?
On doubling current, Heat becomes 4 times its original value.
What will be the heat when current is doubled?
If current I is doubled , heat H will be four times.
When the current is reduced to half the heat generated will be?
Answer. Answer: : If the resistance of a conductor is reduced to half its initial value, then the heating effect in the conductor will become half. When current transmit through a conductor, heat energy is generated in the conductor.
What happened to the amount of heat generated when current is halved?
Answer. Explanation: Heat will be 1/4 th of earlier heat generated as H is directly proportional to square of current…. Hi friend, If the current passing through an electric heater has been halved then the heat produced will also be reduced to one fourth.
What happens to heat when resistance is halved?
Answer Expert Verified now, here you can see Heat is inversely proportional to resistance. so, if resistance of any electric circuit is halved , then the value of heat produced will be doubled.
What happens to the current if the resistance is reduced to one fourth of its original value?
Current Electricity. What will be the change in the resistance of Eureka wire, when its radius is halved and length is reduced to one-fourth of its original length? Implies, there is no change in resistance when radius is halved and length is reduced to one-fourth of it’s original length.
What will be the resistance R of wire when Radius is halved to one fourth of its original length?
Comparing (4) and (5), we see that the resistance of the wire is the same even after changing the dimensions as per the given question. Hence, when the radius is halved and length is reduced to one-fourth of its original length the resistance still remains constant.
What happens to the current if the resistance of the conductor is doubled halved tripled and one fourth?
If the potential difference across the ends of a conductor is tripled the current flowing through it also gets tripled. Again, The current is inversely proportional to the resistance. Therefore,if the resistance of the conductor is doubled,the current gets halved.
What is the effective resistance in the given circuit?
The effective resistance of a circuit containing resistances in parallel is smaller than any of the individual resistances. For example : R1=2Ω and R2=3Ω ∴ Effective resistance Rp1=R11+R21. Maximum effective resistance will be when all the resistors are in series combination. So, Reffmax=n R.
How do I calculate effective resistance?
For a circuit with resistances R1 and R2 in series or in parallel as in Figure 2, the effective resistance can be calculated by using the following rules. Rab = R1 + R2.