In Ohm\'s law, V = IR. what are the units of V, I and R? Provide an example from

Question

In Ohm's law, V = IR. what are the units of V, I and R? Provide an example from your daily experiences of two physical quantities that are directly proportional to each other. Provide an example from your daily experiences of two physical quantities that are inversely proportional to each other. The resistance of a wire can be written as, R = Rho L/A, where R = Resistance; L = length of the wire; A = pi r^2 = Area of cross-section of the wire of radius r, and p = resistivity, a constant for a certain material. Based on the information provided here, answer the following questions How will the resistance of a wire change if the length of the wire is doubled? How will the resistance of a wire change if the radius of the wire is doubled? How will the resistance of a wire change if the length of the wire is quadrupled and the radius is doubled? R is directly proportional to the area of cross-section of the wire. True or False R is inversely proportional to the area of cross-section of the wire. True or False

Explanation / Answer

1)

V = IR

v = volt (v)

I = current (I)

R = resistance (ohm)

2)

F = ma; force is directly propotional to the mass.

W = mg ; work is directly propotional to the mass

3)

F = kq1q2 / r^2

In this case force is directly propotional to the distance square

F(gravitation) = Gm1m2 / d^2

In this case force is directly propotional to the distance square

4)

When the length is doubled then its resistance will also becomes three times.

5)

If radius is increased means area of cross section is increase then resistance is decrease.

6) remain same

7) false

8) true

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