Name: ______
SNC1P Electricity Exam Practice Questions 1P 2017
1. How many different ways can one charge a neutral object?
2. Explain why static electricity cannot be used to power most electrical devices.
3. Match each definition in Column A to the correct term in Column B:
Column A / Column Ba. Method that transfers charges to Earth / i. Electroscope
b. Equipment that can detect static charge / ii. Induction
c. Method of charge transfer when combing your hair / iii. Contact
d. Method of charge transfer that can produce sparks / iv. Grounding
e. Method of charge transfer when an object is touched / v. Friction
4. Name four practical applications that use electrostatic principles.
5. A negatively charged ebonite is brought near one end of a neutral metal bar without touching.
How to charge the ebonite negatively? Use the provided electrostatic series on the next page
7 a. Use the electrostatic series and an arrow to indicate the movement of electrons when silk is rubbed against Lucite:
SILK LUCITE
b. Which one holds electrons more strongly: Silk or Lucite? Circle one
8. When a neutral metal sphere is charged by contact with a positively charged glass rod, what happens to the sphere? (Does it gain/lose protons and/or electrons? And if so from where?)
9. Fill in the blank:
a. When charging by contact, the neutral object ends up having ______type of charge as the charging object
b. When charging by induction, the neutral object ends up having ______type of charge as the charging object
c. When charging by friction, the neutral object ends up having ______type of charge as the charging object
10. What is the purpose of grounding?
11. Where is a person most likely to be hit by lightning?
12. What is the main difference between charging by induction and charging by contact?
Charging by contact / Charging by induction13. What 4 factors affect the resistance of a wire and how do they do so?
Factors / How they affect the resistance of a wire14. How many 1.5V cells connected in series are required to get a potential difference of 3V?
15. Design a circuit in which
a. Two light bulbs are parallel to another other; both
these two light bulbs are in series with a third light bulb
b. Each light bulb has their own switch
c. Ammeters and voltmeters are used non-redundantly
to measure current and voltage
d. A 3-cell battery and all 3 cells are parallel
e. The battery is in series with all light bulbs
16. A small generator in a power station produces 250A of current at a potential difference of 200V. What is the resistance of the generator? / 17. Find the resistance of an electric light bulb if there is a current of 0.8A when the potential difference across the bulb is 120 V (show all work for full marks)18. a. What instrument is used to measure potential difference in a circuit?
How should such instrument be connected to a load? / b. What instrument is used to measure current?
How should such instrument be connected to a load?
19. What is the monthly cost of operating a 60-W security light for 12 hrs each night? Assume that there are 30 days in a month and the electricity cost is 7 cents per kW.h ($0.07)
20. What are the renewable energy sources learnt in class?
21. What are the non-renewable energy sources learnt in class?
22. What type of energy transformation happens in each device? State the input and output type of energy. (If there’s more than one type of output energy, state the main type of output energy.)
Input energy / ® / Output energya solar-powered calculator
a battery-powered radio
a hand crank portable fan
23. What is the effect on bulb brightness when additional bulbs are added to a
a. Series circuit b. parallel circuit
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