Series and Parallel Circuits



Series and Parallel Circuits Solutions

| |[pic] | |

|1. |1.) [pic] |What does the ammeter read? |

| |2.) [pic] |What does the voltmeter read? |

| |3.) [pic] |How much power does the 50-ohm resistor dissipate? |

| |4.) since current is the same everywhere in series, the greatest resistance has the most power: |Which resistor uses the most power? |

| |80Ω |What would each meter read if the 50-ohm resistor were |

| |5.) the voltmeter would read 0 Volts since it would have nothing across it but a wire; the new |removed? |

| |current would be: |What happens to the total power used if the potential |

| |[pic] |difference is increased to 60 V? |

| |6.) If V doubles, and R stays the same, total P would quadruple, from [pic] | |

| |[pic] | |

| | | |

|2. | |What does the voltmeter read? |

| |In parallel, voltage stays the same = 36 Volts. |What does ammeter A1 read? |

| |[pic] |What is the effective resistance of the circuit? |

| |[pic] |What does ammeter A2 read? |

| |The total current is given by: [pic] |Which resistor dissipates the most power? |

| |Here the voltage is constant so using the formula [pic], the smallest resistor gets the most |How much power does it dissipate? |

| |power: 9Ω |If another 12-ohm resistor is added in parallel to the |

| |[pic] |circuit above, what happens to each of the following: |

| |a) same b) same c) increases d) decreases |Voltmeter reading: |

| | |Ammeter A1 reading: |

| | |Ammeter A2 reading: |

| | |Total resistance: |

| |[pic] | |

|3. | |Find the voltages and currents that the meters shown in |

| |[pic] |the diagram at left would read. |

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