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Name____________________________ Reading Guide for Ch. 17 Direct Current 1. Read p. 615-617. Define: a. an Ampere b. current c. resistance 2. If electricity is made of negative electrons, and if protons are locked in the nucleus and cannot flow, why is current defined as the flow of positive charge. 3. Recalculate the current in example 17.1 if 4.0 microCoulombs of charge were transported in 300 ms. Read p. 617-622 4. Explain how batteries work 5. What 2 metals would you use from table 17.1 to make the highest voltage battery cell? __________________ _________________ What would the voltage of 1 such cell be? How could you exactly double the voltage? 6. “Electromotive force” (EMF) is almost synonymous with voltage. Explain the difference between EMF and voltage. 7. Define a. load b. direct current c. amp-hour rating 8. People talk about devices “using up” electricity, but the text says that electricity is never “consumed”. Explain this apparent contradiction. Read “Resistance’ pp. 624-627 9. Write the equation for Ohm’s Law and define each variable. 10. Define ammeter voltmeter 11.Use figure 17.17 to explain in your own words how an ammeter and a voltmeter are connected differently in an electrical circuit. 12.Recalculate example 17.4 to find the voltage if the current were 700 Amps and the resistance were 100 microhms. Read “Resistivity” pp. 627-631. 13.Copy formula 17.4 and explain what each variable means. Read 631-634 14.Give 3 formulas for calculating electrical power and tell what all symbols mean. 15.Tell how you would increase or decrease V, I or R to get the maximum power running through a circuit. 16.Recalculate the power through each circuit element in ex 17.7 if the current were doubled to 10 Amps and the voltage of the top battery were doubled to 24 volts.