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Electricity Semster 1 Review P1
Test Description: Electricity Review for Units 1 - 4
Instructions: Answer all questions to get your test result.
1) An atom with an addtitional Electron is considered a(n) _______
A
Ion
B
Molecule
C
Proton
D
Neutrino
2) which of the following is a good conductor?
A
Wood
B
Glass
C
Copper
D
Resistor
3) Increasing Voltage (assuming resistance stays the same) will result in ________
A
Decreased Wattage
B
Increased Ohms
C
Increased Current
D
Decreased Capacitance
4) A transformer is suppossed to...
A
Generate power
B
Increase/Decrease Voltage
C
Convert AC into DC power
D
Be used as an electro-magnet
5) Red, White, Yellow, Gold
A
290,000 +304,500 / -275,500
B
264 +277 / -250
C
1,500 +1,650/ -1,350
D
27,000 +31,050 / -22,950
6) Voltage = 32 , Current = 8.3, Resitance = ____
A
R = 265.6
B
R = 8.332
C
R = 3.855
D
R = 0.259
7) Voltage = ___ , Current = 30mA, Resitance = _____
A
E = 17 R = 56.667
B
E = 84 R = 2.8
C
E = 18 R = 6,000
D
E = 32 R = 1,066.667
8) Current is measured in...
A
Wattage
B
Resistance
C
Amps
D
Volts
9) 8.35k = ______
A
8,350,000
B
8,350
C
0.835
D
0.000 835
10) When measuring current you should....
A
Increase voltage
B
Disconnect power
C
Break the circuit, then place the probes where the break is
D
Set meter to ohms, then turn up capacitance
11) Which correctly shows Ohm's Law at work?
A
E = I/R
B
R*E = P
C
I = E/R
D
Moving magnetic fields near copper will induce a current flow in the opposite direction
12) In series circuits...
A
ET = ER1 = ER2 = ER3
B
ET = RT/IR1
C
RT = 1/((1/R1)+(1/R2)+(1/R3))
D
IT = IR1 = IR2 = IR3
13) In parallel circuits...
A
IT = IR1 = IR2 = IR3
B
RT = R1+R2+R3
C
ET = RT/IR1
D
RT = 1/((1/R1)+(1/R2)+(1/R3))
14) A capacitor with a label that says 34V, 17uF on it...
A
Will damage if your power supply puts more than 17uF into it
B
Can only handle 34V
C
Has reverse polarity protection
D
Can handle less than 17uF of capacitance added to it
15) How many leads are on a DPST toggle switch
A
5
B
8
C
4
D
2
16) What creates a Sinewave on its output?
A
AC Generator
B
Inductor
C
DC Motor
D
Capacitor
17) Frequency is defined as....
A
Root Mean Square
B
How long it takes to make 1 rotation
C
The number of rotations per second
D
The time for all Peak voltages
18) What advantage does 3 Phase AC have over 1 Phase AC?
A
Extra power generated
B
It never outputs 0V
C
It is safer to work on
D
It is easily rectified into DC
19) What is another name for a potentiometer?
A
Variable Resistor
B
Variable LDR
C
Variable Inductor
D
Variable Capacitor
20) Copper becomes magnetic when....
A
there is a moving magnetic field near by
B
DC current is pulsating through a farad
C
the lines of flux are in line with a permenant magnet
D
there is a magnetic field near by
*select an answer for all questions
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