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Why is it dangerous to touch terminals of high voltage capacitor even after applied potential difference has been turned off?
Wiki User
∙ 11y ago
A capacitor is used to store charge. It does this by the means of an electrochemical reaction. After the charging circuit is turned off, this charge - if not discharged by any means - is still present in the capacitor. High-Voltage capacitors can amass sufficient current for it to be lethal at said voltage, and they can deliver all of it at the slightest contact.
For example, a flasher circuit used in a typical photo camera can deliver lethal voltage, even when it's been charged from a 1.5V battery. The current doesn't need to be high (and is typically very low).
I've made this mistake more than once in my life, and I've had screwdrivers welded to the capacitor terminals by their charge. :D
It is worthy of note that some devices and circuits act as capacitors even when they're not designated as such! For example, a Cathode-Ray Tube (the big-ass thing in a tube TV) is a very good high-voltage capacitor itself, and can hold a charge for a long time (even weeks)!
Wiki User
∙ 12y ago
Wiki User
∙ 11y agoA capacitor stores voltage. If there is not a discharge resistor the charge remains for some period after the supply voltage is turned off. If you are not careful you can discharge this voltage through your body and get shocked.
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What potential (voltage) exists between two power supply terminals if 5 joules of energy are required to move 10 coulombs of charge between the two terminals?
Half a volt, because the energy is the charge times the potential difference.Another AnswerYou should be asking what the 'potential difference' is between the two terminals, not the 'potential'. Note that 'voltage' is another term for potential difference.
How can you use a 3 phase capacitor as a single phase capacitor?
Just use any two of the three terminals that are available, this will give you a single phase capacitor.
How do you prevent shock by capacitors?
Discharge the capacitor, normally with a resistor accross the terminals (Calculated size)
What is terminal PD?
A terminal potential difference is the potential difference appearing across the terminals of a voltage source, such as a battery or a generator, which varies according to the load supplied.When the battery or generator is off load (i.e. no load is connected to it), the terminal potential difference is equal to the electromotive force of that battery or generator.The terminal potential difference tends to decrease as the load current increases, due to a corresponding increase in the internal voltage drop of the battery or generator.
What does x1 stand for on a electrical transformer?
In North America, a transformer's terminals are marked with a combination of letters and numbers. The letter 'H' represents the higher-voltage terminals, while the letter 'X' represents the lower-voltage terminals. Odd numbers (1, 3, etc.) represent the 'start' of a winding, while even numbers (2, 4, etc.) represent the 'end' of a winding. If the potential difference across terminals X1 - X2 is in phase with the potential difference across H1 - H2, then the transformer is described as having 'additive polarity'; otherwise, it has 'subtractive polarity'.
What will happen if two terminals of capacitor are shorted?
When the terminals of a capacitor are connected together, the capacitor will discharge, returning to a zero potential state. Capacitors resist voltage change, meaning that if the capacitor is in a circuit that has zero voltage potential, the capacitor will eventually achieve zero potential. If the capacitor is in a circuit that has a 5 volt potential, the capacitor will seek and attempt to maintain that 5 volt potential (provided that the capacitor is rated at 5 volts or more). In an AC circuit, the capacitor will tend to smooth out the sin wave of the current, resisting change in both directions. In a DC power supply circuit, a capacitor will tend to reduce the voltage "ripple", and if the circuit is designed properly, will provide a smooth DC voltage. Shorting the terminals of a capacitor is effectively what often happens in many circuits; it's not a problem.
What does a battery create between terminals?
Potential difference (voltage)
What is the potential difference across the terminals of a battery?
Please share your answer?
It has a potential difference between the positive and negative terminals?
It is a battery.
What should be pressures for 3 phase condenser?
Pressure is equal to voltage and is the potential deference between the capacitor two terminals
What potential (voltage) exists between two power supply terminals if 5 joules of energy are required to move 10 coulombs of charge between the two terminals?
Half a volt, because the energy is the charge times the potential difference.Another AnswerYou should be asking what the 'potential difference' is between the two terminals, not the 'potential'. Note that 'voltage' is another term for potential difference.
How does voltage produce current?
Voltage across two terminals mean there exists a potential difference, and when the circuit gets closed, due to this potential difference the current flow.
Can an 2 farad capacitor still be used if the terminals were crossed at connection?
I Rather not think that you can buy 2 farad capacitor and no the terminals must follow polarity guidelines.
Why do electric cell have two terminals?
They are the negative and positive terminals. Higher potential andl ower potential terminals
How do you tell the difference between a cathode and anode?
A:The difference is potential a anode requires a positive potential and the cathode requires a negative potential ANSWER : I wander what a zener will behave with this explanation. Both have cathode and anode terminals
How can you use a 3 phase capacitor as a single phase capacitor?
Just use any two of the three terminals that are available, this will give you a single phase capacitor.
Why connect a 100 Ohm resistor to the two terminals of a capacitor If the voltmeter doesn't turn to zero would be better to use a larger resistor?
We can guess that the resistor is used for discharging the capacitor's plates. Generally we short the two terminals on a capacitor to discharge it fully. A resistor will take more time to do this than shorting-out the terminals: the higher the resistance, the longer the time that will be taken to discharge a capacitor fully.
