13.2- MORE ABOUT RESISTANCE

Question 1

What do resistors in series pass the same of?

Answer 1

pass same current

Question 2

What is the total p.d. in a series circuit equal to?

Answer 2

sum of individual pds

Question 3

What is the total resistance in a series circuit equal to?

Answer 3

sum of individual resistances

Question 4

What is the pd of resistors in parallel like?

Answer 4

same p.d.

Question 5

What is the current through a parallel combination of resistors equal to?

Answer 5

sum of individual currents

Question 6

What is the heating effect of an electric current in any component due to?

Answer 6

resistance of component

Question 7

What do the charge carriers do? (resistance heating)

Answer 7

repeatedly collide with positive ions of conducting material

Question 8

What is there a net transfer of? (resistance heating)

Answer 8

net transfer of energy from charge carriers to positive ions due to collisions

Question 9

When a charge carrier loses KE in a collision, what happens? (resistance heating)

Answer 9

force due to p.d. across material accelerates it until it collides with another positive ion

Question 10

At what rate does heat transfer to the surroundings happen if the component is at constant temp?

Answer 10

same rate as power supplied to component

Question 11

If the rate of heat transfer to surroundings from component, is same as rate of power supplied to component, what is the equation for rate of heat transfer?

Answer 11

I²R

Question 12

If a component heats up, what is the temperature rise dependent on? (2)

Answer 12

power supplied to it + rate of heat transfer to surroundings

Question 13

What is the equation for energy transferred to object by electric current?

Answer 13

I²Rt

Question 14

Does the energy transferred per second to component dependent on direction of current?

Answer 14

no