Chapter 26 - Current & Resistance

Question 1

Electric Potential

Answer 1

(V) - The Electric Potential Energy (U) per unit of charge that would be possessed if a charged object is placed within an Electric Field at a given location.

Location-based. Most at positive areas.

Question 2

What are the two necessities for running a circuit?

Answer 2

1. A closed conducting loop in the external circuit that stretches from the high potential, positive terminal to the low potential, negative terminal.
2. An energy supply capable of doing work on a charge to move it from a low energy location to a high energy location and thus establish an electric potential difference across the two ends of the external circuit (i.e. a battery).

Question 3

Current

Answer 3

Change in the flow of positive charges over change in time.

i = Rate of charge flow over time. The current is simply the ratio of the quantity of charge and time.

i = dq/dt
Units: C/s = Ampere

Question 4

Unit for Current

Answer 4

Ampere = Coloumb/Second