Calculating Electricity

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Presentation transcript:

Calculating Electricity Ohm’s Law and Power Equation

Relationship between voltage, current, and resistance Ohm’s Law Relationship between voltage, current, and resistance

Ohm’s Law E represent voltage, (E is short for electromotive force) I represent current measured in amperes R represent resistance measured in ohms

Ohm’s Law Relationship between E, I, and R E = I x R

Ohm’s Law Assume that 10 A of current flows in circuit having a total resistance of 11 ohms. What is the source voltage? E = I x R

Ohm’s Law Using the formula E = I x R E= 10 A x 11ohms E = 110 volts

Ohm’s Law Assume that there are 6 amps of current flowing through a 120 volt circuit. What is the resistance? R = E ÷ I

Ohm’s Law Using the formula R = E ÷ I R = 120 volts ÷ 6 amps R= 20 ohms

Ohm’s Law Assume that you need to know how much current is flowing through a 115 volt circuit containing 25 ohms of resistance. What is the amperage of the circuit? I = E ÷ R

Ohm’s Law Using the formula I = E ÷ R I = 115 volts ÷ 25 ohms I = 4.6 amps

Relationship between watts, amps, and volts Power Equation Relationship between watts, amps, and volts

Power Equation P for watts (P represents power) I for amps E for volts

Power Equation Relationship between P, I, and E P = I x E

Power Equation Assume that .83 amps of current flows through 120 volt circuit. How many watts of electrical power are being used? P = I x E

Power Equation Using the formula P = I x E P = .83 amps x 120 volts P = 99.6 watts of power

Power Equation Assume that there are 5, 100 watt light bulbs being operated on a 115 volt circuit. How many amps of current are flowing through the circuit? I = P ÷ E

Power Equation Using the formula I = P ÷ E I = 500 watts ÷ 115 volts I = 4.35 amps of current

Power Equation Assume that there is a 1200 watt coffee pot pulling 10 amps. What is the source of voltage? E = P ÷ I

Power Equation Using the formula E = P ÷ I E = 1200 watts ÷ 10 amps E = 120 volts