

Understanding EMF and Circuit Equations
Interactive Video
•
Physics
•
9th - 10th Grade
•
Practice Problem
•
Hard
Nancy Jackson
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does the term 'EMF' stand for in the context of circuit equations?
Electromagnetic Force
Energy Magnetic Field
Electromotive Force
Electric Magnetic Field
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which equation correctly represents the relationship between EMF, terminal potential difference, and internal resistance?
E = I(R - r)
E = I(R + r)
E = V + IR
E = V - IR
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the equation E = I(R + r), what does the lowercase 'r' represent?
Load resistance
Internal resistance
External resistance
Total resistance
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the first example problem, what is the value of the internal resistance given?
0.5 ohm
4 ohm
1 ohm
2 ohm
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the calculated EMF in the first example problem?
6 volts
5 volts
4 volts
7 volts
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the second example problem, what is the first step to solve the problem when the current is not given?
Calculate the total resistance
Assume a current value
Find the current using E = I(R + r)
Directly use E = V + IR
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the value of the current found in the second example problem?
0.5 ampere
1 ampere
1.5 ampere
2 ampere
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