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### 30 Cards in this Set

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 what is the formula for resistance? v R = ---- I Resistance voltage ---- Current what is the formula for power? power = current* voltage p= IV whar is the formula for energy? Energy = Power * time E= P*T what is the formula for power? Power = Current * voltage what is the formula for Current? charge ------ = current time what is the formula for power? Power = Current * voltage whar is the formula for energy? Energy = Power * time E= P*T what is the formula for voltage? Voltage = Current * Resistance V= IR energy ------- charge What is Electric Current? The flow of charge; measured in Amperes What does electric potential mean? energy per coloumb(J/C) at a location in an electric field; measured in volts and often called voltage Potential difference? difference in electric potential (voltage) between two points. Free charge flows when there is a difference, and will continue until both points reach a common potential. What does ampere's equal? charge = coulomb ------ ------- time second What does potential difference, pressure difference, voltage potential and voltage difference have in common? potential difference, pressure difference, voltage potential and voltage difference: ALL REFER TO VOLTAGE OR THE FORCE THAT MOVES IN A CIRCUIT What are 2 examples of voltage sources? Battery and Generators all are types of "electric pumps" What are 3 variables of delveloping Ohm's Law ? Resistance: measured in Ohm's lessing of flow of charge, restriction Voltage: measured in volts; forcethat moves electrons in a circuit Current: charge over times *Charge is measured in coulombs Time for this is seconds How is current and resistance inversely related? When resistance goes up Current goes down Current~ 1 ------ Resistance What are the symbol for Current and Voltage, Resistance? Current = I Voltage = V Resistance= R How is current and voltage directly related? As voltage goes UP Current goes DOWN current~voltage What is ohm's law? I = V - R Current = voltage ----- resistance 1 ampere = 1volt -------- 1 ohm Voltage= current * resistance What is the formula for ampere? ampere = volt ---= ohm What is the formula for current? Current= voltage -------- resistance I = v - r how is voltANG and resistance DIRECTLY RELATED? AS VOLTAGE goes up RESISTANCE goes UP What is an other formula to find voltage? joule ----- coulomb What does force consist of? potential difference electric pressure pressure difference What does 1 Ampere equal? 1 Amperes = 1COULOMB --------- seconds Symbol is A What does force consist of? potential difference electric pressure pressure difference 1 watt = 1 v * AMPERE =electric power energy over time = powers watts is a unit of POWER watts is a unit of POWER dc & ac A Direct Current (DC) referring charge flowing in one direction. A battery produces direct current in a circuit because terminals of the battery always have the same sign of charge. Alternating Current (AC) electrons in the circuit move first in one direction then in the opposite direction, alternating back and forth rather than in fixed positions. This action is accomplished by alternating the polarity of voltage at the generator or other voltage source. watt / kilowatt Power is a watt, and kilowatt. Energy is kilowatt-hour. Power: watt, kilowatt; energy: kilowatt-hour. 1 watt = 1 v * AMPERE =electric power energy over time = powers watts is a unit of POWER watts is a unit of POWER