Download Chapter 7: Electricity Study Guide

Chapter 7: Electricity Study Guide
1. Protons have a _____________ charge. Electrons have a _____________ charge. Neutrons have a
_____________ charge.
2. The ___________________ is the unit for electric current.
3. Examples of conductors = __________________________________________________
Examples of insulators = ____________________________________________________
4. A complete, unbroken path through which electric charges can flow is a(n)
________________________
5. A disadvantage to using fuses is that when it burns out it ________________________________________.
6._______________________ causes charges in a circuit to move.
7. The build up of charges on an object is called _________________________________________.
8. A connection that allows current to take the path of least resistance is called a
______________________________________.
9. A device used to open and close an electric circuit is a (n) __________________________________.
10. In a series circuit with three bulbs, all the bulbs become ___________________________ if more bulbs
are added.
11. What will happen in a parallel circuit if a bulb goes out? Explain. _______________________________
_________________________________________________________________________________________________
12. The loss of static electricity as electric charges transfer from one object to another is called
__________________________________________.
13. The greater the ____________________________________, the less current there is for a given voltage.
14. The continuous flow of charges through a material is called __________________________________.
15. The ____________________________________________________ states that charges are not created or
destroyed.
16. Like electric charges ________________________ each other. Opposite electric charges
___________________ each other.
17. The attraction or repulsion between electric charges is called the ________________________.
18. The resistance of a parallel circuit _______________________________ as you add more branches.
19. The strength of the electric field of a charged particle becomes greater as the distance from the
particle __________________________.
20. ________________________ is the measure of how difficult it is for charges to flow through an object.
21. What are the four factors that determine the resistance of an object: _______________________,
_________________________, ________________________ and ________________________.
22. A circuit is electrically __________________________ if it can carry electric current from a short circuit
directly to Earth.
23. In a flashlight, the battery is a source of electrical ________________________.
24. Adding bulbs to a(n) _____________________ circuit causes all the bulbs to shine less brightly.
25. For the same resistance, an increase in voltage causes a greater electric __________________.
26. If two wires of the same material have the same thickness but different lengths, the
____________________________ wire will have a greater resistance.
27. A switch can be used to open and close an electric _______________________.
28. In a(n) _________________ circuit, different parts of the circuit are on separate branches.
29. A(n) ________________________ is a material in which charges cannot flow easily.
A(n) __________________________ is a material in which charges can flow easily.
30. For a current of 3 A(amps) and a voltage of 9 V(volts), the resistance in a circuit is
_______________________________.
Make sure you understood the concepts that were applied in the simulation activities we did in the
computer lab (Balloon with sweater and wall: Know what happens to the balloon when you rub it on
a sweater or cloth, John Travoltage: static electricity and static discharge, Electric Field Hockey:
electric fields and how they behave and Electric Circuits: open and closed circuits, series and
parallel circuits, conductors’ and insulators, etc)
Be able to solve problems using the following formulas (the formulas will be on the test.
You need to know which to use and the units of measurement for each):
voltage = I (current) x R (resistance)
current = V (voltage) / R (resistance)
resistance = V (voltage) / I (current)
Power = V (voltage) x I (current)
Energy = P (power) x T (time)
31. Voltage is measure in _______________
Current is measured in ______________
Energy is measured in _______________
Resistance is measured in _____________
Power is measured in _____________
32. Identify the circuits above as either series, parallel or both.
A= ________________________
B= __________________________
D= ________________________
C= ______________________
E= __________________________
Know the advantages and disadvantages of series and parallel circuits.
Know what will happen if bulbs go out in each and why.