Voltages across circuit elements

In summary, the conversation discussed the possibility of having two nonzero voltages across individual elements in a series circuit that add up to a zero voltage. It was determined that this could only occur if the individual voltages were equal but of opposite sign. Examples of this could include resistors or batteries in a series circuit, as well as inductor-capacitor circuits near the resonance frequency. The conversation also emphasized the importance of considering phase relationships in these scenarios.
  • #1
tomrja
18
0

Homework Statement



The voltages across two circuit elements in series is zero. Is it possible that the voltages across the individual elements are nevertheless not zero? Give an example.

Homework Equations



NA

The Attempt at a Solution



I am not really sure where to start with this problem. Any suggestions?
 
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  • #2
I can't give away very much because you haven't shown an attempt.
How about listing some "circuit elements"?
Could you meet the condition with two resistors and a current flowing through them? Why not? How about two ? elements?
 
  • #3
From my point of view it seems that the only way two nonzero voltages could add up to a zero voltage is if both individual voltages were equal but of opposite sign for two circuit elements in series. Does this seem plausible?
 
  • #4
I read up a little bit on this subject and found that at resonance xL=xC, IxL=Ixc, therefore VL=Vc.

Thank you for your suggestions.
 
  • #5
With inductors, you would be in the same position as with resistors; two voltages adding to make a larger voltage.
both individual voltages were equal but of opposite sign
Definitely on the right track here! Forget inductors, resistors, capacitors. Can you use two batteries?
 
  • #6
Don't forget inductors and capacitors! Consider a series RLC circuit (with small R) driven by a voltage source near the resonance frequency. Think about phase relationships.
 

FAQ: Voltages across circuit elements

What is voltage?

Voltage is a measure of the potential difference between two points in an electrical circuit. It is often referred to as the "pressure" or "force" that pushes electrons through a circuit.

How do I calculate voltage?

Voltage can be calculated using Ohm's Law, which states that voltage (V) is equal to the product of current (I) and resistance (R): V = I x R. Alternatively, voltage can be measured using a voltmeter.

What are the units for voltage?

Voltage is typically measured in volts (V), which is the unit for electric potential difference. Other common units for voltage include millivolts (mV) and kilovolts (kV).

What is the difference between AC and DC voltage?

AC (alternating current) voltage varies in magnitude and direction over time, while DC (direct current) voltage remains constant in both magnitude and direction. AC voltage is commonly used for power transmission, while DC voltage is used in electronic devices.

How does voltage affect circuit elements?

Voltage can have different effects on different circuit elements. For example, a higher voltage can result in a larger current flowing through a resistor, while a capacitor will store more charge at a higher voltage. The behavior of a circuit element is determined by its voltage-current relationship, also known as its characteristic curve.

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