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# 6 current ohm resistivity

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### 6 current ohm resistivity

1. 1. ELECTRIC CURRENT-The flow of charges.    Charges flow from the positive terminal to the negative terminal. There must be intermediary path for the charges (conductors). There must be potential difference between two points. This will literally push the charges from one terminal to another. The greater the potential, the greater the push.
2. 2. I= Q/t I=current (A/ampere) Q=charge (C/coulomb) t=time interval (s/second)
3. 3. Over the course of an 8 hour day, 3.8x104 C of charge pass through a typical computer (presuming it is in use the entire time). Determine the current for such a computer.
4. 4. I=1.32 A
5. 5. I= V/R I=current (A/ampere) V=voltage (V/volts) R=resistance (Ω/ohms)
6. 6. VOLTAGE- electrical potential difference, electric tension or electric pressure RESISTANCE- property of a conductor due to which it opposes the flow of current through it.
7. 7. An incandescent bulb allows 114mA of current to pass through when connected to a 220 V source. What is the resistance of the bulb?
8. 8. R=1,930Ω
9. 9. What amount of current flows through a 90.0Ω wire when it is connected to a 120V source? How many electrons pass through the wire every second?
10. 10. I=1.33 A Q=1.33 C
11. 11. 1. 2. The large window air conditioner in Anita Breeze's room draws 11 amps of current. The unit runs for 8.0 hours during the course of a day. Determine the quantity of charge that passes through Anita's window AC during these 8.0 hours. A power saw at the local hardware store boasts of having a 15-Amp motor. Determine its resistance when plugged into a 110-Volt outlet
12. 12. 3. Defibrillator machines are used to deliver an electric shock to the human heart in order to resuscitate an otherwise non-beating heart. It is estimated that a current as low as 17 mA through the heart is required to resuscitate. Using 100,000 Ω as the overall resistance, determine the output voltage required of a defibrillating device.
13. 13. Answer Q=3.2x105 C R=7.3 Ω V=1700 V