14 points] The following questions are regarding resistors and current. Which of

Question

14 points] The following questions are regarding resistors and current. Which of the statements are (1) correct (indicate with a ) and which are incorrect (indicate with an )? a) Two resistors are made of the same material. Resistor A is short with a small diameter while B is long with a large diameter. For this arrangement resistor A must have a larger resistance than resistor B. b) Light bulbs are most likely to burn out right when they are turned on because the resistance of the bulb is lowest at that point and then increases as the bulb heats up. e) 100 electrons per second moving to the right is the exact same current as 100 protons per second moving to the left. d) For a resistor that obeys Ohm's Law, the voltage across the resistor is directly proportional to the current through the resistor.

Explanation / Answer

a) Resistance =pL/A

Resistance is directly propotional to area

and Area =pie*r^2

so we can say more the radii ,less will be the resistance

so Resistor A has more resistance as compared to B--True

b)Tungsten gains resistance as it heats. Resistance is the amount of ‘push back' a material has against an electric current. The only thing that heats tungsten in a light bulb is electric current flowing through it.

so B is True

c)I = Q/t

charge of electron is -1.6*10^-19C

and charge of proton is +1.6*10^-19 C

since charges are same so both will have same current--True

d)ohm's law says

V=IR

so True

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