# If The Resistor Slows The Current By Reducing The Emf By 12v Then The

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## If The Resistor Slows The Current By Reducing The Emf By 12v Then The

In other words, however much the battery boosts the voltage, the resistors drop it by the same amount - hence, the need for the boost at the battery. Let's use the following diagram as an example: **If the** resistor **slows the current by reducing the EMF by 12V, then the** power source must boost **the EMF** back to its original strength by increasing by ...

In other words however much the battery boosts the voltage the resistors drop it by the same amount - hence the need for the boost at the battery. Let's use the following diagram as an example: **If the** resistor **slows the current by reducing the EMF by 12V then the** power source must boost **the EMF** back to its original strength by increasing **by 12V**.

15/08/2014 · To calculate voltage across a resistor in a series circuit, start by adding together all of the resistance values in the circuit. **Then**, divide the voltage across the circuit by the total resistance to find **the current**. Once you have **the current**, calculate voltage for the individual resistors by multiplying **the current** by the resistance.

DC Circuits Containing Resistors and Capacitors. ... there is no IR drop, and so the voltage on the capacitor must **then** equal **the emf** of the voltage source. This can also be explained ... when the batteries powering the camera begin to wear out, their internal resistance rises, **reducing the current** and lengthening the time it takes to get ready ...

Having a PWM, means you do not have a resistor in series,meaning no waste in the form of heat. We just shuttle the Motor between ON & OFF, and the average gives us the voltage. So , no waste of power is there. Having a 0.5 Duty Cycle for a **12V** supply, gives a 6V on avaerage, and using the switching we control the speed.

However, if a circuit is powered by a constant **current** source, and you increase the resistance, **the current** stays the same, the resistance increases, and again Ohm's Law (V = IR) describes what happens to the voltage.

If the mechanical and electrical powers are correlated, as are **the current** and torque, **then** voltage and speed must be, also. And they are, because the faster the rotor spins through the stator field, the greater back-**emf** it will generate. This is Faraday's law of induction. So, …

Back **EMF** always acts to reduce the changing magnetic field through the coils. It does so by generating a voltage which opposes the supply voltage, thus **reducing the current**. In ideal DC motor where R=0 and L=0, and RPM is constant with no load, back **EMF** will be exactly the same as the supply voltage. Back **EMF** vs RPM on the 106-002 DC Motor

A brushed DC electric motor is an internally commutated electric motor designed to be run from a direct **current** power source. Brushed motors were the first commercially important application of electric power to driving mechanical energy, and DC distribution systems were used for more than 100 years to operate motors in commercial and industrial buildings.

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