Transcript CHAPTER 2

CHAPTER 2
ELECTRICAL QUANTITIES
AND OHM’S LAW
OBJECTIVE.
• AFTER TODAY, STUDENTS WILL
UNDERSTAND THE ELECTRICAL
VALUES OF AMPS, VOLTS,
OHMS,AND WATTS. STUDENTS WILL
ALSO BE ABLE TO SOLVE PROBLEMS
USING OHM’S LAW TO FIND
VOLTAGE, CURRENT, RESISTANCE
AND POWER.
COULOMB: IS A QUANTITY OF MEASUREMENT FOR
ELECTRONS=6,250,000,000,000,000,000
AMP:ELECTRICAL MEASUREMENT OF FLOW
OF ELECTRONS=1 COULOMB PER SECOND
AMPS
• MEASURE OF CURRENT FLOW IN A
CIRCUIT
• WATER EXAMPLE=GALLONS PER
MINUTE
• OHM’S LAW SYMBOL FOR AMPS IS I
IT WOULD TAKE 1.3 SECONDS FOR THE LIGHT TO COME
ON
VOLTAGE
• ELECTROMOTIVE FORCE (EMF)
• IT IS THE FORCE THAT PUSHES
ELECTRONS THROUGH A WIRE
• ELECTRICAL PRESSURE(POTENTIAL)
• OHM’S LAW SYMBOL FOR VOLTAGE
IS E
RESISTANCE IN A CIRCUIT USES UP THE VOLTAGE
RESISTANCE
• OHM=UNIT OF RESISTANCE TO
CURRENT FLOW; NAMED AFTER
GEORGE OHM
• OHM’S LAW SYMBOL IS R
WATT
• UNIT OF POWER IN A CIRCUIT
• OHM’S LAW SYMBOL IS P
• LIGHT BULBS; WATER HEATERS;
HOUSE ELECTRIC METERS
• POWER=CURRENT X VOLTAGE
E=I x R
I=E/R
R=E/I
LETS REVIEW…...
• WHAT IS AN AMP?
• OHM’S LAW
SYMBOL FOR AN
AMP?
• WHAT IS
VOLTAGE?
• WHAT IS OHM’S
LAW SYMBOL
FOR VOLTAGE?
• WHAT IS AN OHM?
• UNIT OF MEASURE
FOR POWER?
• OHM’S LAW
FORMULA?
• OHM’S LAW STATES?
• OHM’S POWER
FORMULA?
• METRIC PREFIXES?
THAT’S ALL…..