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Because emf is the very source of voltage, either chemical or inductive, an can be meassured at open circuit only so, internal resistance of the supplier is not affecting it.

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9y ago

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What does the size of the current depend on?

A: The EMF and total resistance


How do you determine the emf and internal resistance of a cell?

You can measure the emf of a cell by using a voltmeter, as this draws current from a cell. You can use the voltage, the emf, and the load resistance to determine the internal resistance of the cell.


Does the induced emf in a circuit depend on the resistence of the circuit?

The induced emf in a circuit is not directly dependent on the resistance of the circuit. It is primarily determined by the rate of change of magnetic flux through the circuit. However, the resistance of the circuit can affect the current flow and ultimately impact the magnitude of the induced emf through Ohm's law (V = IR).


What does the size of a current depend upon?

One way to determine current is to measure it, with an ammeter. Another way is to calculate it using Ohm's law: current = voltage / resistance.


Why magnet is used for making standard resistance coil?

magnet produce emf it maintain the resistance as same


How does voltage drop related to impressed emf?

Voltage drop is resultant of IR ie current and the line resistance, not dependent on impressed emf


Does current depends on its resistance?

The current flow in an electrical circuit depends on the applied electromotive force (EMF, measured in volts), and the total resistance along the entire circuit. Rising EMF or dropping resistance cause increased current flow


How do you rearrange the emf equation into a form suitable for plotting a straight graph?

To rearrange the electromotive force (emf) equation into a form suitable for plotting a straight graph, you typically isolate the dependent variable on one side. For example, if the equation is of the form ( E = IR + r ) (where ( E ) is emf, ( I ) is current, ( R ) is resistance, and ( r ) is internal resistance), you can rearrange it to ( I = \frac{E - r}{R} ). By plotting current ( I ) on the y-axis and the emf ( E ) on the x-axis, the slope of the resulting line will relate to the internal resistance and the resistance of the circuit.


The expression that relates emf potential current and resistance is Ohm's law?

Yes, that is what it is called.


What is the difference between the emf of a battery and the lost volts when discharging called?

Internal resistance


How do you find voltage when amps is known?

You don't. If you know how many Amperes in an electrical circuit and also what the total resistance in the circuit is, then EMF (Volts) = current (Amps) x resistance (in Ohms). EMF stands for Electromotive Force, and its unit of measure is the Volt.


What happens to the generated voltage of a self excited generator if shunt field resistance is greater than the critical resistance?

it doesn't develop emf ..........