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Concept Developments 34 – 1 page 125. Created for CVCA Physics By Dick Heckathorn 14 March 2K + 5. Electric Current. 1a. The units of electric potential difference are: volts amperes ohms watts 1b. It is common to call electric potential difference: voltage amperage wattage.

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Concept developments 34 1 page 125 l.jpg

Concept Developments 34 – 1page 125

Created for CVCA Physics

By

Dick Heckathorn

14 March 2K + 5


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Electric Current

  • 1a. The units of electric potential difference are:

  • volts amperes ohms watts

  • 1b. It is common to call electric potential difference:

  • voltage amperage wattage


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Electric Current

  • 1c. The flow of electric charge is called electric:

  • voltage current power

  • and is measured in:

  • volts amperes ohms watts


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Ohms Law or a narrow pipe?

  • 1. How much current flows in a 1000 ohm resistor when 1.5 volts are impressed across it?

  • 0.0015 A


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  • 5. During a lie detector test, a voltage of 6 V is impressed across two fingers. When a certain question is asked, the resistance between the fingers drops from 400 000 ohms to 200 000 ohms. What is the current (a) initially through the fingers, and (b) when the resistance between them drops?

  • (a) 0.000015 A (b) 0.000030 A


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  • 10. The current in an incandescent lamp is 0.5 A when connected to a 120‑V circuit, and 0.2 A when connected to a 10‑V source.

  • Does the resistance of the lamp change in these cases? Yes

  • Explain your answer and defend it with numerical values.

  • 50 ohm at 10 V 240 ohm at 120 V


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Concept Developments 34 – 2 connected to a 120‑V circuit, and 0.2 A when connected to a 10‑V source.page 127


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Electric Power connected to a 120‑V circuit, and 0.2 A when connected to a 10‑V source.

  • 1. What is the power when a voltage of 120 V drives a 2‑A current through a device?

  • 240 watts

  • 2. What is the current when a 60‑W lamp is connected to 120 V? 0.5 amps


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That’s all folks! light on all the time. If your fixture contains a 60‑W bulb at 120 V, and your local power utility sells energy at 8 cents per kilowatt‑hour, how much will it cost to leave the bulb on for the whole month?


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