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What follows is a plain HTML version of the Quiz.
All the question's and answer's in this quiz are found in Tom Henry's book, "Ohm's law".
1. A resistor of 8 ohms and a resistor of 4 ohms are connected in series with a 12 volt power supply. The current through the 4 ohm resistor should measure amperes.
- [ ] 1
- [ ] 0.67
- [ ] 1.5
- [ ] 0.5
2. Two distribution lines, Line A and Line B, each serve separate loads of 5000 kW. The load on Line A has a high power factor and the load on Line B has a low power factor. Which of the following statements about these two lines is true?
- [ ] Not enough information is given
- [ ] Line A current is the same as Line B current
- [ ] Line B carries a higher current than Line A
- [ ] Line A carries a higher current than Line B
3. Electricity cost $.085 per kW hour. The total cost to operate a 175 watt television for 10 continuous days is .
- [ ] $8.64
- [ ] $3.57
- [ ] $9.19
- [ ] $2.57
4. A 240v, 20 amp branch circuit, if the maximum allowable voltage drop through the wiring is 2.4 volts, the maximum allowable resistance of the wiring is ohms.
- [ ] 12
- [ ] 1.2
- [ ] 122
- [ ] .12
5. A 5 ohm resistor and a 10 ohm resistor are connected in parallel. If the common circuit feeding both resistors has a current of 15 amperes, the current through the 10 ohm resistor is amperes.
- [ ] 5
- [ ] 15
- [ ] 8
- [ ] 10
6. An electric range is rated 240 volts and draws 40 amps. The splice has .1 ohms resistance. How much power is being lost at the splice?
- [ ] 400 watts
- [ ] 40 watts
- [ ] 160 watts
- [ ] .4 watts
7. An electrical installation has a 115v load which consumes 1,000 watts. The voltage drop specification is 1%. The maximum total resistance of the wire in the circuit is ohms.
- [ ] .07
- [ ] 2.3
- [ ] .13
- [ ] .09
8. Four electric heaters are installed and the resistance rating of each heater is 10 ohms, 20 ohms, 40 ohms, 50 ohms. If the heaters are wired in parallel, what is approximately the total resistance on a 240 volt circuit?
- [ ] 4.6 ohms
- [ ] 5 ohms
- [ ] 3 ohms
- [ ] 2 ohms
9. Three heaters R1, R2, and R3 are installed in a series circuit. The power used by R1 is 100 watts and the power used by R2 is 75 watts. The power used by the circuit is 225 watts. The power used by heater R3 is watts.
- [ ] 36
- [ ] 50
- [ ] 24
- [ ] 75
10. A 240v, single-phase circuit has a load of 10 amps. The circuit has a combined length of 400 feet and a resistance of 1.75 ohms per 1000 feet. The total power lost in the conductor is watts.
- [ ] 70
- [ ] 60
- [ ] 123
- [ ] 175
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