Download Ch 17: Electric Potential Study Guide

Name: ______________
Ch 17: Electric Potential
Study Guide
1. The ____________ ____________, V at any point in space is the electric potential energy
per unit charge. To calculate V the following formula may be used:
2. Electric potential difference is the work done to move 1 C electric charge between two points. It
is measured in ________ and is sometimes called ____________.
3. Draw an electric dipole in the space provided. Be sure to indicate the charges and the direction
of the electric field.
4. Perpendicular to the electric field, __________________ lines indicate where the potential is
the same around a charge. Draw these around the charges in the drawing you made in
question number 3 above.
5. A device used to store charge and electric energy is a _______________. It is made of two
non-touching _______________ separated by an insulating material called a
______________.
6. Give at least two examples of the types of insulating materials that are used in these devices.
7. How many types of electric charges are there and how do these charges interact? Describe in
words and/or drawings in the space provided below.
8. A conductor is a material that allows electric charge and heat to move relatively
easily. Why is that? What is happening at the atomic level? (describe in words
and/or drawings below)
9. What type of material(s) tends to be a good conductor?
10. Insulators are materials that do not freely allow charge to flow. Why is that? What is happening
at the atomic level? (describe in words and/or drawings below)
11. What type of material(s) tends to be a good insulators?
12. There are three primary ways that objects can become charged. Describe each below.
a.
b.
c.
13. The electric field intensity between two large, charged, parallel metal plates is 6000N/C and
the plates are 0.05 m apart. What is the electric potential difference between them?
14. A voltmeter reads 400 V across two charged, parallel plates that are 0.020 m apart. What ist
he electric field between them?
15. When a potential difference of 125 V is applied to two parallel plates, the field between them is
4.25 x 103 N/C. How far apart are the plates?
16. A 12-V car battery can store 1.44 x 106 C when it is fully charged. How much work can be
done by this battery before it needs recharging?
17. An electron in a TV picture tube passes through a potential difference of 18,000 V. How much
work is done on the electron as it passes through that potential difference?
18. The electric field in a particle-accelerator machine is 4.5 x 105 N/C. How much work is done to
move a proton 25 cm through that field?
19. A 2.2 µF capacitor first is charged so that the electric potential differences is 6.0 V. How much
additional charge is needed to increase the electric potential difference to 15.0 V?
20. When a charge of 2.5 X10-5 C is added to a capacitor the potential differences increases from
12.0 V to 14. 5 V. What is the capacitance of the capacitor?
21. How much charge is stored on a 4.7 µF capacitor when a potential difference of 12 V is applied
to it?