Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
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
|
|
|
|
A current of 4 amp flows through a circuit having a resistance of 30ohms.apply ohms law for voltage;
|
120 volts
|
|
|
|
a current of 1.5 amp flows through a resister of 80ohms. Determine the voltage drop;
|
120 volts
|
|
|
|
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;
|
R=e/i
|
|
|
|
the voltage applied to a circuit is 25 volts, and the current that flows is 5 amps. find the circuit resistance.
|
5 ohms
|
|
|
|
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.
|
80 ohms
|
apply ohms law for resistance
|
|
|
one volt is defined as the electromotive force which will produce a current flow of one ampere through a resistance of,
|
1 ohm
|
|
|
|
a millivolt (mv) is_________________ of a volt.
|
one thousandth
|
|
|
|
a microvolt (u~v) is_______________ of a volt.
|
one millionth
|
|
|
|
a kilovolt is_____________________.
|
1,000 volts
|
|
|
|
To convert kilovilts to volts you must multiply by _________________
|
1,000
|
|
|
|
If you have 14,400 volt line with 10 amps whats the resistance in ohms?
|
1,440 ohms
|
|
|
|
the basic unit of measure of resistance is the____________.
|
ohm
|
|
|
|
electric power is defined as a product of voltage and current, or as a formula, write the formula for power in watts.
|
P=ExI
|
|
|
|
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.
|
watt
|
|
|
|
An applied voltage of 120 volts sets up a current flow of 3 amp, the power expended according to formula 1 is?
|
p=ExI 360watts
|
|
|
|
How much power is produced by current of 15 amps flowing in a 120 volt circuit?
|
P=ExI. 1800
|
|
|
|
A 200 watt lamp is operated from a 120 volt source, calculate the current through the lamp.
|
I=P/E. 1.67 amp
|
|
|
|
A current of 1 amp flows through a 240 watt resistor. determine the voltage drop across the resistor?
|
240/1=240 volts
|
e=p/i.
|
|
|
The common unit for electrical energy is a______________,?
|
watthour
|
|
|
|
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______________
|
time
|
|
|
|
What is the formula for watts? |
P=ExI |
|
|
|
Electric bill for your home is based on the ________________ used during a month?
|
Kilowatt hours
|
|
|
|
If lamps and appliances in a home consume 5000 Watts during 12, hours how much electrical energy, in kilowatt hours, is being spent?
|
5000x12=60,000---60,000/1,000=60kwhr
|
w=pt
|
|
|
In the above question at .07 cents a kilowatt hour how much would the electricity cost?
|
$4.20$
|
|
|
|
What is the cost of operating a 100 watt soldering iron for 8 hours if the charge is 7 cents a kilowatt hour?
|
56.00$
|
|
|
|
What is the current in a 30 watt lamp designed for operation on a 120 volt line?
|
.25 amps
|
|
|
|
Ohms law states that the current flowing in a closed electric circuit is directly proportional to the applied voltage, and inversely ________________________________________
|
Proportional to the circuit resistance
|
|
|
|
If, however, the voltage remains constant and the resistance of a circuit is increased, the current will be_________________.
|
Decreased
|
|
|
|
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 _____________.
|
amperes. I
volts. E ohms. R |
|
|
|
State as a mathematical formula Ohm's Law for amperes?
|
i=e/r
|
|
|
|
a voltage of 200 volts is applied to a circuit having a resistance of 40 ohms. determine the current flow in the circuit?
|
5 amps
|
Apply Ohm's law
|
|
|
A voltage of 40 volts is applied to a circuit having a resistance of 100 ohms. determine the current flow in the circuit
|
.4 amps
|
|
