Electronics-Resistance and Power
Electronics-Resistance and Power
1. How do fixed resistors usually fail?
- slowly over time
- by increasing their value
- by becoming an open circuit
- by increasing their value and becoming an open circuit
2. With Ohm's law, if voltage increases and resistance stays the same:
- current remains the same
- power decreases
- current increases
- resistance decreases
3. Which formula shows a direct proportionality between power and voltage?
- V = IR
- P = VI
- P = IR
- I = V/R
4. With 1 mA of current, what wattage rating should a 470 ohm resistor have?
- 1/4 watt
- 1/2 watt
- 1 watt
- 2 watts
5. How is a 3.9 komega.gif resistor color-coded?
- red, white, red, gold
- red, green, orange, silver
- orange, white, red, gold
- orange, green, orange, silver
6. What resistor type is found in SIPs and DIPs?
- metal film
- wirewound
- metal oxide
- thick film
8. What are the two major categories for resistors?
- low and high ohmic value
- commercial and industrial
- low and high power value
- fixed and variable
10. The six basic forms of energy are:
- light, sun, magnetic, chemical, electrical, and mechanical
- electrical, mechanical, light, heat, magnetic, and chemical
- electrical, mechanical, sun, heat, chemical, and light
- potential, sun, light, chemical, electrical, and mechanical