0
How much current flows through a resistor of 285 ohms if the potential difference across the resistor is 122 volts?
Wiki User
∙ 10y ago
Use Ohm's Law, i.e.,
V=IR
here, V=voltage
I=current
R=resistance
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
How much current flows through a resistor with zero potential difference?
No current flows when the the voltage is zero.
Is it true that a resistor raises the voltage across its terminals as current flows through it?
It depends on how you choose to define current and polarity...The normal convention is that current flows from positive to negative, even though that is not true. It is simply a convention, making it easier to analyze a circuit and to not have to deal with negative numbers. In this convention, the terminal of the resistor that current is flowing into will be more positive than the other terminal.The accepted reality is that current flows from negative to positive. In that convention, the terminal of the resistor that current is flowing into will be more negative than the other terminal.It does not really matter which convention you use, so long are you are consistent in the application of the convention and in the treatment of signs.Thank you, so it is not true, right?Another AnswerNo, it is not true. In order for current to pass through a resistor, there must be a potential difference across its ends. The magnitude of the current depends on the value of the potential difference. So a larger current is the result of a larger potential difference, NOT the other way around.The same applies to 'voltage drops'. Voltage drops are not the result of a current passing through resistors in series; voltage drops are necessary for the current to flow through each resistor.
Is voltage established through a resistor or across a resistor?
Current = charge (electrons) flowing through a resistor.Voltage = energy lost across a resistor.Power = energy lost across a resistor per second.So yes you are correct. Current is established through a component, while voltage and power are established across a component.Answer'Voltage' is a synonym for 'potential difference'. As the name implies, voltage describes the difference in potential between (or 'across') two different points. So voltage is applied ACROSS a resistor.Further to the original answer. voltage is NOT equivalent to 'the energy lost across a resistor', and power is NOT 'established across a resistor' (power is simply a 'rate', nothing more)!
What is the difference between resistance and resistor?
Resistance is the property of a conductor, which determines the quantity of current that passes through it when a potential difference is applied across it. A resistor is a electrical componet with a predetermined electrical resistance, like 1 ohm, 10 ohms 100 ohms 10000 ohms etc.. depending on how much current you want to pass through a circuit, you would design the circuit with the required resistors
If a 100 ohm resistor is needed in an electric circuit carrying a current of 0.3 amperewhat resistor would you select?
A 100 ohm resistor carrying a current of 0.3 amperes would, by Ohm's Law, have a potential difference of 30 volts. A current of 0.3 amperes through a voltage of 30 volts would, by the Power Law, dissipate a power of 9 watts. You need a 10 watt resistor, alhough it is better to use a 20 watt resistor. E = IR 30 = (0.3)(100) P = IE 9 = (30)(0.3)
How does the potential difference in the resistor change as the current through it changes?
The potential difference accross the resistor changes mainly due to gradual increase accumulation of electrons in the lower potential region which will in turn affect the potential gradient as the current flows through the resistor
When the current traveling through a resistor is increased what happens to the voltage that travels through the same resistor?
Your question reveals fundamental misunderstandings about the nature of electricity.'Voltage' is simply another word for 'potential difference', and a potential difference appears across opposite ends of the resistor; it doesn't 'travel through' that resistor! Current, on the other hand, DOES 'travel through' the resistor and is caused by the potential difference across the resistor.Resistance is the ratio of potential difference to current. So if the resistance remians unchanged when the current through it doubles, then it has happened because the potential difference has doubled.
How much current flows through a resistor with zero potential difference?
No current flows when the the voltage is zero.
What will be the potential difference across a 50Ω resistor if a current of 500mA is flowing through it?
Potential difference equals current multiplied by resistance or E = IR therefore the answer to your question is 25 volts
What is possible unit for the product VI where V is the potential difference across a resistor and you is the current through the same resistor?
A possible/probable unit is Watts.
What is the current across a 10k resistor and 20 volts?
First of all, current goes straight through the resistor, not across it.If the potential difference between the ends of the resistor is 20 volts,and its resistance is 10,000 ohms, then the current through it isI = E/R = 20/10,000 = 0.002 ampere = 2 milliamperes
What is the resistance of a resistor if the potential differennce across the resistor is 9 V when current of 1 A flows through the resistor?
9 ohms
What is the potential difference neede to send 2a through a 5 ohms resistor?
V=I*R -- Potential (Voltage, V) = Current (Amperage, I) * Resistance (Ohms)2A*5Ohms = 10V
Is it true that a resistor raises the voltage across its terminals as current flows through it?
It depends on how you choose to define current and polarity...The normal convention is that current flows from positive to negative, even though that is not true. It is simply a convention, making it easier to analyze a circuit and to not have to deal with negative numbers. In this convention, the terminal of the resistor that current is flowing into will be more positive than the other terminal.The accepted reality is that current flows from negative to positive. In that convention, the terminal of the resistor that current is flowing into will be more negative than the other terminal.It does not really matter which convention you use, so long are you are consistent in the application of the convention and in the treatment of signs.Thank you, so it is not true, right?Another AnswerNo, it is not true. In order for current to pass through a resistor, there must be a potential difference across its ends. The magnitude of the current depends on the value of the potential difference. So a larger current is the result of a larger potential difference, NOT the other way around.The same applies to 'voltage drops'. Voltage drops are not the result of a current passing through resistors in series; voltage drops are necessary for the current to flow through each resistor.
Is voltage established through a resistor or across a resistor?
Current = charge (electrons) flowing through a resistor.Voltage = energy lost across a resistor.Power = energy lost across a resistor per second.So yes you are correct. Current is established through a component, while voltage and power are established across a component.Answer'Voltage' is a synonym for 'potential difference'. As the name implies, voltage describes the difference in potential between (or 'across') two different points. So voltage is applied ACROSS a resistor.Further to the original answer. voltage is NOT equivalent to 'the energy lost across a resistor', and power is NOT 'established across a resistor' (power is simply a 'rate', nothing more)!
What is the difference between resistance and resistor?
Resistance is the property of a conductor, which determines the quantity of current that passes through it when a potential difference is applied across it. A resistor is a electrical componet with a predetermined electrical resistance, like 1 ohm, 10 ohms 100 ohms 10000 ohms etc.. depending on how much current you want to pass through a circuit, you would design the circuit with the required resistors
What is the difference between resistor and resistance?
Resistance is the property of a conductor, which determines the quantity of current that passes through it when a potential difference is applied across it. A resistor is a electrical componet with a predetermined electrical resistance, like 1 ohm, 10 ohms 100 ohms 10000 ohms etc.. depending on how much current you want to pass through a circuit, you would design the circuit with the required resistors
