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What is the Ratio of potential differences across a device to the current that passes through it?
Wiki User
∙ 13y ago
the ratio would be 2:1.
Wiki User
∙ 13y ago
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Can a wattmeter that has a current through its current coil and a potential across its voltage indicate zero?
A: Only if the current is very small and the scaling very large. Like trying to measure micro amps on amp meter
Does voltage flow across a circuit or is it impressed across a circuit?
Voltage is impressed across a circuit. Current flows through a circuit.
What are the differences between emf and voltage drop?
emf and voltageAnswerElectromotive force is the potential difference created by a source, such as a battery or generator, when it is not connected to a load -in other words, on 'open circuit'.Voltage drop is the potential difference across a load, such as a resistor, which causes current to flow through that load.A voltage drop occurs, internally, in batteries and generators, when they are supplying a load. The battery or generator's terminal voltage, when supplying a load, is its e.m.f. less its internal voltage drop.
What is the voltage across the load R when the switch is ON?
It's the product of the resistance of that resistive load and the current passing through it.
What effect if any does connecting a voltmeter across a resistor in a circuit have on the current through the resistor?
A very very tiny amount of the current that would normally flow through the resistor instead flows through the voltmeter, allowing it to make its measurement. For most purposes this very very tiny amount of current can be completely ignored.
What are basic principle of a series circuit?
The same current passes through all the devices, and the sum of the potential differences across the devices is equal to the terminal potential difference across the power supply.
What is required for current to flow through an electrical current?
Potential Source connected across a Closed Circuit Path.
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.
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 happen is the potential difference across is double?
If the potential difference between the ends of any conductor is doubled, then the current through the conductor is also doubled.
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 equation states ohm's law?
Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference across the two points.eq: V=IR where V= potential differenceR= resistanceI=current
What type of current has steady potential difference across a circuit?
That would be DC or Direct Current.
Is the sum of the potential differences equal to the voltage applied across them?
Yes for a closed circuit
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 potential difference across a 1500 ohm resistor carrying a current of 0.075 A?
Potential Difference across a resistor is given by, Potential Difference = Resistance * Current = 1500 * 0.075 = 112.5 Volts
Can a wattmeter that has a current through its current coil and a potential across its voltage indicate zero?
A: Only if the current is very small and the scaling very large. Like trying to measure micro amps on amp meter
