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EET 110 - Survey of Electronics

EET 110 - Survey of Electronics. Chapter 11 - Ohms Law . Chapter 11 - Ohms Law. Electrical Units and prefixes Voltage - V, emf or E - in VOLTs (V) Current - I in AMPEREs (A) Resistance - R in Ohms (  ). Prefixes billion - 10 9 - giga - G million - 10 6 - mega - M

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EET 110 - Survey of Electronics

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  1. EET 110 - Survey of Electronics Chapter 11 - Ohms Law

  2. Chapter 11 - Ohms Law • Electrical Units and prefixes • Voltage - V, emf or E - in VOLTs (V) • Current - I in AMPEREs (A) • Resistance - R in Ohms ()

  3. Prefixes • billion - 109 - giga - G • million - 106 - mega - M • thousand - 103 - kilo - k • one - 100 - • one thousandth - .001 - 10-3 - milli - m • one millionth - .000001 - 10-6 - micro -  • one billionth - 10-9 - nano - n • one trillionth - 10-12 - pico - p

  4. Units • To convert amperes (A) to milliamperes (mA), move the decimal point three places to the right. • .012A = 12 mA • To convert mA to A, move to the left • 450mA = .45A

  5. Chapter 11- Ohms Law • The basic form of ohms law is

  6. Alternately this is • The current, (I) in a circuit is directly proportional to the applied voltage (V) and inversely proportional to the resistance (R)

  7. Alternate forms • Three forms of Ohms law • I = V/R • V = I x R • R = V/I

  8. To calculate current • if V = 120v, R = 15 ohms, what is the current?

  9. Voltage • If a DC generator delivers 2.5A to a lamp that has 50ohms resistance, voltage must be?

  10. Resistance • Suppose an electric kettle draws current of 8A when connected to 120v. What is the resistance?

  11. Ohms Law Circle V I R

  12. Power Formulas • Power in watts = volts x amperes • P = V x I • using ohms law we can get • P = I 2 R • P = V 2/ R

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