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