1. Calculate the voltage applied to a 100 ohm resistance circuit if the current

Question

1. Calculate the voltage applied to a 100 ohm resistance circuit if the current of measured current is 0.02 Amperes.

2. Explain how we should connect a voltmeter in the circuit to measure the voltage in a resistance 6. Name four factors on which the resistance value of a metallic conductor.

3. How much does the resistance of a metallic conductor vary with respect to the original if its length and its diameter are duplicated simultaneously? Remember that the section area transversal is A = ? r ^ 2. Show it by comparing the formula of the original resistance and the resistance formula once its length and diameter have been doubled.

4. Why is resistivity called an intrinsic property?

5. In this laboratory practice we must connect the rheostat to its maximum length, Why is this precaution important?

6. Raise the resistivity formula and clear the resistance, length and cross-sectional area.

7. One of the teams performing the Resistivity practice obtained the following results:

Voltage V( volts)

Calculate the resistance, the cross-sectional area and the resistivity of the wire in
question.

8. If the length of a wire increases, its electrical resistance: _______________
9. If the diameter and length of a wire increase, its resistivity: ____________
10. If the diameter of a wire increases, its electrical resistance: _______________
11. If the diameter and length of a wire decrease, its resistivity: ____________

Wire Tipo de material

Voltage V( volts)

Current
I (A) Resistance
R (ohm) diameter d
(cm) Area
A (cm^2) Long
L (cm) Resistivity
? (ohm-cm) A Nichrone 0.25 0.016 0.005 100

Explanation / Answer

1)Volatage=I*R=0 02*100=2volts

2)Voltameter must be connected in parallel with R6.

4factors which determine resistance

(i)resisitivity

(ii) length of conductor

(iii) Area of cross section of conductor

(iv) Temperature

(3)R=resistivity*length/area so if both are doubled

R'=resisticity*2L/4*area=R/2

So it will be halved

(4)because it depends on conductor and is same for any dimension of same conductor.It depends only on temperature and conductor

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