ATTENTION ELECTRICITY STUDENTS: Please see me at the ICT room second floor admin building on Thursday, October 16, 2014 during your regular periods. This is in connection with your second grading examination (actual hands-on). Kindly inform your classmates regarding this information. Thanks..God bless.
Misamis Oriental General Comprehensive High School
Cagayan de Oro City
First Grading Examination in Electricity – IV
Instructions: This on-line examination requires a whole sheet of paper for you to answer (answer only), submit your answers on Monday, August 11, 2014 during your regular class schedules. Goodluck and God bless.
I. Multiple Choice: 30 Points (2 points each)
1. The most basic formula in electric circuits
a.Watt’s law b. Kirchoff’s law c. Ohm’s law
2. If the Current flow (I) is unknown, the formula in Ohm’s law should be
a. I = V/R b. I = R/V c. I = V x R
3. If the Voltage is missing, the formula in Ohm’s law will be
a. V = R X I b. V = I/R C. V = R/I
4. The formula for Total resistance in series circuit
a. Rt = ra x rb /ra + rb b. 1/Rt = 1/R1 + 1/R2 + 1/R3 …. c. None of the above
5. Find the current in the 100 Ohms resistor with a supply voltage of 50 volts.
a. 50 Amperes b. 0.50 Amperes c. 0.12 Amperes
6. What voltage must be applied to a 500 Ohm resistor to produce a current of 0.55 Amperes?
a. 752 Volts b. 275 Volts c. 257 Volts
7. A heating element draws a current of 1.5 Amperes when connected to a 120 volts source. Find its resistance.
a. 180 Ohms b. 82 Ohms c. 80 Ohms
8. 1 kilovolt =
a. 100 volts b. 1,000 volts c. 10,000 volts
9. 10 megohms =
a. 10,000 Ohms b. 1,000 Ohms c. 10,000,000 Ohms
10. 1 Ampere =
a. 10 Milliamperes b. 1000 Milliamperes 10,000 Milliamperes
11. 500 Milliamperes =
a. 0.5 Ampere b. 5 Amperes c. 0.05 Ampere
12. 1 Millivolt =
a. 0.0001 volt b. 0.001 volt c. 0.01 volt
13. 1 Microampere =
a. 0.000001 Ampere b. 0.00001 Ampere c. 0.001 Ampere
14. 1 Kilowatt =
a. 100 Watts b. 0,001 Watt c. 1000 Watts
15. It is a device use to protect by immediately trip/disconnect the circuit once short circuit is detected.
a. Circuit breaker enclosure b. Circuit breaker c. Parallel Circuit
II.Problem Solving (D.C. Circuits) 15 Points each
Problem 1A
Solve for the Following:
Total Resistance( Rt) in Kilohms Current at R2 in Milliamperes Voltage drop at R23 in volts
Voltage Drop at R1 in volts VR1 Current at R3 in Milliamperes
Current at R1 in Milliamperes Total Current (I) in Milliamperes
Problem 1B
Resistance Values:
R1 = 2 Ω, R2 = 4 Ω, R3 = 8 Ω, R4 = 8 Ω, R5 = 4 Ω, R6 = 4 Ω
Solve for the following:
a. R12 b. R3456 c. Resistance Total Rt d. Current Total (I) in Amperes
e. VR1 f. VR2 g. VR3456
III. Schematic Diagramming: 40 Points
Problem: Connect (4) bulbs controlled in (3) locations connected to a 220 volts supply.
What to do? Draw a schematic diagram based on the given problem.
Use 1 junction box for your connections.
Note: Do not forget to submit this requirements on Monday, August 11, 2014. I cannot be with you on Thursday and Friday due to training of football athletes for the 2014 MILO LITTLE OLYMPICS.
