7Problem 1: Select the correct statements. (a) Inside an emf device, such as a d

Question

7Problem 1:
Select the correct statements.
(a) Inside an emf device, such as a dry cell battery, charges are moved from a lower electric potential point to a higher electric potential point by work on the charges from other energy sources.
(b) The more resistors connected in parallel, the smaller the effective resistance.
(c) The Junction Rule comes from energy conservation.
(d) In an RC circuit, the time constant determines how fast the capacitor may be charged or discharged.
(e) For a car battery with internal resistance, the largest power it outputs is when the external load to the battery goes to zero, because this is when the total current reaches a maximum value.
Answer:
Problem 2:
Select the correct statements.
(a) Ohm’s Law defines resistance as the ratio of voltage over current. So a resistor’s resistance is 0 when there is no voltage over it.
(b) Current density is a vector because it is proportional to the electric field in the conductor.
(c) For most materials resistivity drops when they are cooled down.
(d) The resistivity of a 1 inch long gage-16 wire decrease when you mechanically force it into a thinner gage-22 (with smaller cross section) wire (which is now longer than 1 inch),
(e) Connecting two resistors in series and running a current through them. The resistor with larger resistance generates less heat than the other resistor, because electrons move more slowly in it.
Answer:
Problem 3:
Select the correct statements.
(a) When a battery outputs its maximum power, its efficiency is also the highest.
(b) Resistors connected in series always result in a smaller effective resistance.
(c) Kirchhoff’s Junction rule comes from charge conservation.
(d) When a battery is connected to an RC circuit to charge the capacitor, there is a DC current flowing through the resistor even though there is no actual charge moving from one capacitor plate to the other.
(e) Two incandescent light bulbs with specs 100W/110V and 60W/110V are connected in series and then connected to the 110V power supply. The 100W bulb is brighter than the 60W one.
Answer:

Explanation / Answer

1. True - b,c,d 2. True - a,b 3. True - a,c,d

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