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33 Cards in this Set
- Front
- Back
- 3rd side (hint)
The basic form of ohms law is rearranged to find voltage when current and resistance are known. the voltage drop E in volts, produced across a resistive device is equal to the product of the current I flowing through the device, the amperes, and the resistance R of the device, in ohms. state this as a mathematical formula; |
e=IxR
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A current of 4 amp flows through a circuit having a resistance of 30ohms.apply ohms law for voltage;
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120 volts
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a current of 1.5 amp flows through a resister of 80ohms. Determine the voltage drop;
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120 volts
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the basic form of ohms law can also be rearranged to find resistance when voltage and current are known. It can be stated as follows: the resistance R in ohms, of a circuit or component is equal to the applied voltage E, in volts, divided by the resultant current flow I, in amperes. State this as a mathematical formula;
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R=e/i
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the voltage applied to a circuit is 25 volts, and the current that flows is 5 amps. find the circuit resistance.
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5 ohms
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a current of 0.25 amp flowing through a resistor produces a voltage drop of 20 volts across the resistor. Determine the resistance of the resistor.
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80 ohms
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apply ohms law for resistance
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one volt is defined as the electromotive force which will produce a current flow of one ampere through a resistance of,
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1 ohm
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a millivolt (mv) is_________________ of a volt.
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one thousandth
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a microvolt (u~v) is_______________ of a volt.
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one millionth
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a kilovolt is_____________________.
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1,000 volts
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To convert kilovilts to volts you must multiply by _________________
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1,000
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If you have 14,400 volt line with 10 amps whats the resistance in ohms?
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1,440 ohms
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the basic unit of measure of resistance is the____________.
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ohm
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electric power is defined as a product of voltage and current, or as a formula, write the formula for power in watts.
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P=ExI
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one_________is defined as the amount of electric power which is expended when a voltage of one volt produces a current flow of one ampere.
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watt
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An applied voltage of 120 volts sets up a current flow of 3 amp, the power expended according to formula 1 is?
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p=ExI 360watts
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How much power is produced by current of 15 amps flowing in a 120 volt circuit?
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P=ExI. 1800
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A 200 watt lamp is operated from a 120 volt source, calculate the current through the lamp.
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I=P/E. 1.67 amp
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A current of 1 amp flows through a 240 watt resistor. determine the voltage drop across the resistor?
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240/1=240 volts
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e=p/i.
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The common unit for electrical energy is a______________,?
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watthour
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When electric power is expended during a certain time, it performs work; in other words, it produces electrical energy. electrical energy is therefore determined by multiplying the power by the______________
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time
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What is the formula for watts?
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p=exi
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Electric bill for your home is based on the ________________ used during a month?
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Kilowatt hours
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If lamps and appliances in a home consume 5000 Watts during 12, hours how much electrical energy, in kilowatt hours, is being spent?
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5000x12=60,000---60,000/1,000=60kwhr
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w=pt
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In the above question at .07 cents a kilowatt hour how much would the electricity cost?
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$4.20$
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What is the cost of operating a 100 watt soldering iron for 8 hours if the charge is 7 cents a kilowatt hour?
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.0056
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What is the current in a 30 watt lamp designed for operation on a 120 volt line?
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.25 amps
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Ohms law states that the current flowing in a closed electric circuit is directly proportional to the applied voltage, and inversely ________________________________________
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Proportional to the circuit resistance
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If, however, the voltage remains constant and the resistance of a circuit is increased, the current will be_________________.
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Decreased
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By using the symbols E, I and R to represent voltage, current and resistance and assigning units of measure to the three quantities, we can state ohms law as follows: the current I, in _______, which flows in a closed electric circuit is equal to the applied voltage E, in __________, divided by the resistance off the circuit R, in _____________.
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amperes. I
volts. E ohms. R |
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State as a mathematical formula Ohm's Law for amperes?
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i=e/r
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a voltage of 200 volts is applied to a circuit having a resistance of 40 ohms. determine the current flow in the circuit?
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5 amps
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Apply Ohm's law
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A voltage of 40 volts is applied to a circuit having a resistance of 100 ohms. determine the current flow in the circuit
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.4 amps
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