Chapter 27 Concepts - Circuits

Question 1

Define electromotive force (emf)

Answer 1

the emf device does work on charge carriers; the rate at which work changes per charge; units: Volts (V)

Question 2

Discuss the difference between an ideal and real emf device

Answer 2

Real emf device has an internal resistance while an ideal one does not

Question 3

Describe Kirchhoff’s Loop Rule

Answer 3

The algebraic sums of the changes in potential encountered in a complete traversal of any loop of a circuit must be zero

Question 4

Define the resistance rule

Answer 4

for a move through the resistance in the direction of the current, the potential difference is negative
For a move in the opposite direction of the current, the potential difference is positive

Question 5

Describe the resistances for a series circuit

Answer 5

when a potential difference is applied across the resistance in blank, the resistances have identical currents

Question 6

Describe Kirchhoff’s Junction Rule

Answer 6

The sum of the currents entering any blank must be equal to the sum of the currents leaving that blank

Question 7

Describe the resistances for a parallel circuit

Answer 7

When a potential difference is applied across resistance connected in blank, the resistances all have that same potential difference

Question 8

Define an RC circuit

Answer 8

contains a capacitor, an emf device, and a resistor

Question 9

Describe how to find equivalent resistance in series circuits vs parallel circuits

Answer 9

In blank it is the sum of all resistances in the circuit

In blank it is the reciprocal sum of all resistances in the circuit