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

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Presentation transcript:

EET Survey of Electronics Chapter 11 - Ohms Law

b Electrical Units and prefixes Voltage - V, emf or E - in VOLTs (V)Voltage - V, emf or E - in VOLTs (V) Current - I in AMPEREs (A)Current - I in AMPEREs (A) Resistance - R in Ohms (  )Resistance - R in Ohms (  )

b Prefixes billion giga - Gbillion giga - G million mega - Mmillion mega - M thousand kilo - kthousand kilo - k one one one thousandth milli - mone thousandth milli - m one millionth micro - one millionth micro -  one billionth nano - none billionth nano - n one trillionth pico - pone trillionth pico - p

Units b To convert amperes (A) to milliamperes (mA), move the decimal point three places to the right..012A = 12 mA.012A = 12 mA b To convert mA to A, move to the left 450mA =.45A450mA =.45A

Chapter 11- Ohms Law b The basic form of ohms law is

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

Alternate forms b Three forms of Ohms law b I = V/R b V = I x R b R = V/I

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

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

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

Ohms Law Circle V IR

Power Formulas b Power in watts = volts x amperes P = V x IP = V x I b using ohms law we can get P = I 2 RP = I 2 R P = V 2 / RP = V 2 / R