# Module 1

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1. According to Ohm’s law, what happens to circuit current if the applied voltage (a) increases, (b)decreases?
a) Current increases (b) Current decreases
2. According to Ohm’s law, what happens to circuit current if circuit resistance (a) increases, (b)decreases?
(a) Current decreases (b) Current increases
3. 6.What is the equation used to find circuit resistance if voltage and current values are known?
R= E/I
4. 9.What is the term applied to the rate at which a mechanical or electrical force causes motion?
Power
5. 10.How can the amount of current be changed in a circuit?
By changing the circuit resistance or the voltage of the power source.
6. 14.What is the power used in a circuit that has 10 amperes of current through a 10-ohm resistor?
1 kilowatt.
7. 27.What is an open circuit?
A circuit where there is no longer a complete path for current flow.
8. 28.What is a short circuit?
An accidental path of low resistance which passes an abnormally high amount of current.
9. 29.Why will a meter indicate more voltage at the battery terminal when the battery is out of a circuit than when the battery is in a circuit?
The internal (source) resistance of the battery will drop some of the voltage.
10. 30.What condition gives maximum power transfer from the source to the load?
When the load resistance equals the source resistance.
11. 39.What term identifies a single resistor that represents total resistance of a complex circuit?
Equivalent resistor or Req.
12. 40The total power in both series and parallel circuits is computed with the formula: PT = P1 + P2+P3 +...Pn. Why can this formula be used for both series and parallel circuits?
In both cases all the power used in the circuit must come from the source.
13. 46.What is the effect on total resistance and total current in a circuit if an open occurs in (a) a parallel branch, and (b) in a series portion?
(a) Total resistance increases, total current decreases (b) Total resistance becomes infinite, total current is equal to zero
14. 47.What is the effect on total resistance and total current in a circuit if a short occurs in (a) a parallel branch, and (b) in a series portion?
• (a) Total resistance decreases, total current increases (b) Total resistance decreases, total current
• increases
15. 48.If one branch of a parallel network is shorted, what portion of circuit current flows through the remaining branches?
None
16. 49.What information must be known to determine the component values for a voltage divider?
The source voltage and load requirements (voltage and current).
 Author: bugsbunny2255 ID: 121099 Card Set: Module 1 Updated: 2011-12-06 03:42:22 Tags: Chapter Folders: Description: AT3 Show Answers: