Assessment for learning. AC
Presentation
•
Physics
•
12th Grade
•
Hard
Мирлан Джусамбаев
Used 12+ times
FREE Resource
7 Slides • 6 Questions
1
Assessment for learning. AC
2
LO
describe the processes occurring in AC circuits containing resistance;
Apply the Ohm’s law for complete AC circuit containing reactance;
Use Ohm’s law for complete AC circuit;
deduce that the mean power in a resistive load is half the maximum power for a sinusoidal alternating current;
apply the expressions I=0.7 I0
and U=0.7 U0 to distinguish between effective, root-mean-square and peak values of voltage and current intensity
3
Multiple Choice
When an AC is applied across a pure resistance:
the voltage and current are out of phase with each other.
the voltage and current are in phase with each other.
the voltage leads current by 90 degree.
the voltage lags current by 90 degree
4
Multiple Choice
An increase in which factors will cause an increase in the inductive reactance of circuit?
Resistance and capacitive reactance.
Inductance and frequency
Resistance and voltage
5
Multiple Choice
In an AC circuit, the effective voltage is
greater than the maximum instantaneous voltage.
less than the maximum instantaneous voltage.
equal to the maximum instantaneous voltage.
6
Multiple Choice
The term that describes the combined resistive forces in an ac circuit is
resistance.
reactance.
impedance.
7
Multiple Choice
when an alternating voltage is applied across a pure inductance:
the voltage and the current are in phase with each other.
the voltage lags current by 90 degree.
the voltage leads current by 90 degree.
none of above.
8
Multiple Choice
when an A.V of frequency f hertz is applied acrossed a pure inductanceof L henry, XL is:
XL = 2πfL
xL = 1/(2πfL)
XL = R
XL = 1/(2πfc)
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Assessment for learning. AC
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