Parallel Circuits

21. There is a total of 800 mA of current into four parallel resistors. The currents through three of the resistors are 40 mA, 70 mA, and 200 mA. The current through the fourth resistor is

1. 490 mA
2. 800 mA
3. 310 mA
4. 0

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22. Three 47 Ω resistors are connected in parallel across a 110 volt source. The current drawn from the source is approximately

1. 2.3 A
2. 780 mA
3. 47 mA
4. 7.06 A

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23. Three lights are connected in parallel across a 120 volt source. If one light burns out,

1. the remaining two will glow dimmer
2. the remaining two will glow brighter
3. the remaining two will not light
4. the remaining two will glow with the same brightness as before

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24. When a 1.6 kΩ resistor and a 120Ω resistor are connected in parallel, the total resistance is

1. greater than 1.6 kΩ
2. greater than 120 but less than 1.6 kΩ
3. less than 120 but greater than 100 Ω
4. less than 100 Ω

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25. When an additional resistor is connected across an existing parallel circuit, the total resistance

1. remains the same
2. decreases by the value of the added resistor
3. increases by the value of the added resistor
4. decreases

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