Solution for Homework 3-2
Lab 1-3: Voltage
Definitions
1. Difference of potential
Force that moves electrons in a conductor
2. Van de Graaf Generator
A device used to generate electricity by means of friction
3. Direct current
Current that flows in only one direction
4. Alternating current
Current that flows in one direction, then the other
5. Cell
Two electrodes of dissimilar materials immersed in an electrolyte
6. Battery
Several cells connected together
7. Photovoltaic cell
A device used to convert light energy into electrical energy
8. Thermocouple
A device used to convert heat into electrical energy
9. Piezoelectric effect
A process that results when pressure is applied to a crystal
10. Primary cell
Chemical cell that cannot be recharged
11. Secondary cell
Chemical cell that can be recharged
12. Ampere-hour
A rating used to determine how well a battery delivers power
13. Series cells
Increases voltage
14. Series aiding cells configuration
Connecting the positive terminal to negative terminal of cells
15. Series opposing configuration
Connecting negative to negative or positive to positive terminals of a cell
16. Parallel cells
Increase current
17. Series-parallel cells
A combination of series and parallel circuits
18. Voltage rise
Voltage applied to a circuit
19. Voltage drop
Occurs when current flows in a circuit
20. Ground
Common point in a circuit
Questions
1. E
2. Volts
3. V
4.
a. AC generation: S on a side inside a circle
b. Battery:
c. Thermocouple
d. Solar Cell
single cell inside a circle with 2 arrows pointing to it
e. Crystal
5. Total voltage
Lab 1-4:
Resistance
Definitions
1. Resistance
Opposition to electron flow in a circuit
2. Resistors
Resistors are components manufactured to possess a specific value of resistance to the flow of current
3. Ohm
Unit of resistance
4. Tolerance
An indication of the amount a resistor may vary and still be acceptable
5. Carbon composition resistor
Most commonly used resistor in electrical circuits
6. Wirewound resistors
Used in high current circuits where precision is necessary
7. Film resistor
Offers the small size of carbon composition resistors with the accuracy of wirewound resistors
8. Potentiometer
A variable resistor used to control voltage
9. Rheostat
A variable resistor used to control current
10. Series circuit
Provides a single path for current flow
11. Parallel circuit
Provides 2 or more paths for current flow
12. Series parallel circuit
A combination of the above circuits
Questions
1. W
2. R
3
4. Just a listing
5a Series Circuit
See example on site
5b Parallel Circuit
See example on site
5c Series-parallel circuit
See example on site
Lab 1-6a:
Connecting Cells and Batteries
Questions
1. ET = 6.0 V, IT = 500 mA
2. ET = 1.5 V, IT = 1 A
3. ET = 4.8 V, IT = 250 mA
4. ET = 1.2 V, IT = 1 A
5. ET = 1.5 V, IT = 20 A
Lab 1-6b:
Connecting Cells and Batteries
Drawings
Constructing batteries using 1.5 V cells wiht a current rating of 1 A/h
1. 3 V with rating of 1 A/h
In series the voltages add and the amps remain same as the individual cells
The drawing would be of 2 cells in series
2. 6 V with current rating of 2 A/h
In parallel the voltages are the same but the currents add.
The drawing could have 2 parallel lines, each of which contains 4 cells. The 4 cells combine to 6 V on each, with a total current of 2 as required.
3. 9 V with a curent rating of 4 A/n
Similar idea in number 2 above, this would be 6 cells on each of 4 parallel lines.
4. 12 V battery with a current rating of 6 A/h
Similarly, this would be 8 cells on each of 6 parallel lines
5. 1.5 V battery with a current rating of 10 A/h
Could be accomplished with 10 parallel lines containing 1 cell each. They would add to 10 A/h and the V would be that across each - 1.5 V
Lab 1-9: Resistors
in Series
1. RT = 5700 W
2. RT = 3670 W
3. RT = 15,700 W
4. RT = 17,370 W
5. RT = 18,370 W
1. RT =824.56 W
2. RT =279.16 W
3. RT =761.75 W
4. RT =345.43 W
5. RT =256.74 W
Lab 1-11:
Resistors in Series-Parallel
1. RT = 2273.28 W
2. RT = 2519.73 W
3. RT = 1069.77 W
4. RT = 4979.16 W
5. RT = 5813.27 W