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A: It must be be understood that current needs voltage other wise it is zero. An ammeter for DC is always a voltmeter that reads small IR drop to convert that reading into current present. Like an ohmmeter needs volts to read ohm. Both reading are volts it just convert those reading into whatever scale is switch to.
Wiki User
∙ 13y ago
Wiki User
∙ 13y agoAmmeter is used for measuring current and not voltage.
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Why output is constant in saturation region of the transistor in common emitter configuration?
Check the curves to see the behavior. What happens is that the semiconductor material gets saturated with the base current. You cannot get more conductivity. Increasing the base current will not help. Typically a voltage of 0.2 to 0.3 Volt remains.
In a parallel circuit is the current is shared between the loops?
The current splits, part of it goes through each of the separate branches, then it gets back together again.This answer is misleading.What actually happens is this. Each branch draws a current which is determined by the supply voltage divided by the resistance of that branch. The sum of these branch currents is then drawn from the supply.So, the current doesn't actually 'split', but is the sum of the individual branch currents.
What happens to a bulb if the current increases?
It gets brighter.
What is the Formula for series and parallel?
you need to be more specific but my guess is your referring to ohm's law the basic formula is Voltage(V)=current (intensity (A)) multiplied by resistance (Ohms). the formula can be reversed to calculate intensity using voltage divided by resistance or to calculate resistance using voltage divided intensity. an easy way to remember this formula is to make a triangle like this and cover the value you want to find the two bottom ones multiply and the top one gets divided. / \/ V \--------/ I : R \-------------
If the voltage is doubled the ampacity of a conductor is?
Unchanged. The conductor's ampacity is affected by its composition (copper, aluminum, etc.), cross-sectional area, and temperature, not by the supply voltage. The ampacity is limited because any conductor has resistance. When the conductor carries a load (supplies current), the conductor essentially becomes a resistance heater, and gets hot. At some point the temperature will become dangerous, either causing the conductor to melt or damaging the insulation or surrounding materials. The voltage dropped across a conductor that is supplying current to a load is computed by the following formula: E=I^2 X R Or, voltage dropped equals current through the conductor squared times the resistance of the conductor. Notice that the supply voltage is not even part of the equation. All the mentioned parameters - composition, cross-sectional area, and temperature affect its resistance. The ampacity of a conductor installed in a building can also be regulated by law, so, even though a conductor may pass a certain amount of current local laws may prohibit it's use anyway.
How do you connect and ammeter and voltmeter?
Ammeter-Series Voltmeter-Parallel My teacher used to say this at class to make us remember this..... It is this word called VPAS (spelled as 'we pass'), where V denotes Voltmeter, P denotes Parallel, A denotes Ammeter and S denotes Series....... The reason is that, Current gets divided at the nodes while voltage gets divided across a series of resistive loads...... That's why we connect ammeter in series so that we don't divide the current when we're actually measuring the amount of current in the loop and likewise voltmeter in parallel, since voltage remains the same even when the loop splits at a point........
What happens to the current when the ammeter position is changed in a series circuit?
it gets a bigger chance of giving wrong result. ANSWER Absolutely not in series the meter will read the same no matter where it located in the series circuit. the same meter cannot be placed in parallel to measure.
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.
Does electricity shock you more when the voltage is lower?
The sensation from a shock is due to current flowing through your body, not the voltage. You can have a high voltage and low current and not get hurt. A Tesla Coil is an example. As the voltage gets lower your body still obeys Ohm's Law. Voltage = Current x Resistance. If the resistance of your body remains constant as the voltage gets lower, the current will be lower. However, there are many variables that determine the effect of a shock on your body. Variables include the type and amount of current (AC or DC) and the path the electricity takes through the body.
Does the alternating current supplied to the armature winding of a DC motor gets converted to dc by a commutator before it flows through the armature coil of the DC motor?
The commutator is a rotating switch, which reverse the polarity of the generated voltage every half-cycle. So it acts to rectify the output voltage.
What is the reason why it is better to use high voltage instead of low voltage on long distance?
High voltage reduces the amount of energy lost due to the resistance of the transmission material (conductor), by reducing the current. In other words, increasing voltage reduces current, and lower current means less resistance loss. Voltage and current have an inverse relationship, and later on when the electricity gets closer to the consumer, voltages can be decreased which increases the current. Increased current means higher resistance, and it is resistance that does the work.
Which is the dangerous current?
You can't really separate them. It's the current flowing through your body that does the damage, but the value of the current depends on the voltage across your body -the higher the voltage, the higher the resulting current.
How does current transformer works in a substation?
A current transformer works on the same principle as that of a simple transformer however it steps down the high current into a low level so that it can be measured using an ammeter of a suitable range. In some current transformers extra cores are provided. This is done in order to prevent the faulty currents i.e. the over currents, earth faults, differential protections. The extra cores of a C.T. gets saturated as soon as the faulty currents starts flowing and thereby does not harm the main core of the transformer and the ammeter connected. The C.T. is always connected in the line carrying current. It first steps down the current to a measureable form and further gives this current to the ammeter.
What is the equation for power current and voltage?
1. Formula with respect to the current(I) & resistance(R)V = I.R2. Formula with respect to watt power(P) & current(I)V = P/I
How can you convert the voltage into milli amps?
Voltage is a property of electrical potential. Amperes (and miliamperes) are the units of electrical current. Even though these are related to each other in a circuit, they are not the same thing, and they cannot be "converted" into each other.Also, these properties are only related through a "load" the circuit provides (the resistance and inductance of the circuit), and make sense only when related to each other this way. If there is current, there will be voltage as well, but if there's only voltage, there will be no current unless there is some resistance as well (even a wire has resistance) - otherwise the circuit is "open" and no charge is flowing.In a simple circuit with a voltage source and resistor:milliamps = voltage*1000/resistance.If your circuit has diodes, capacitors, inductors, etc. it gets much more complicated.
Is it possible to have electrical voltage exist but no electric current exist?
Yes. For example, a car battery always has a voltage of 12V (unless it gets completely unloaded, of course), between its terminals. But a current will only flow if cables are connected.
Which sequence of energy transformations occurs after a battery-operated flashlight is turned on?
Chemical energy from the battery gets converted to electricity; in the light-bulb, assuming the old-fashioned incandescent light-bulbs, the electricity gets converted to heat, and the heat gets converted to light (part of it; a significant part gets converted to useless heat).Chemical energy from the battery gets converted to electricity; in the light-bulb, assuming the old-fashioned incandescent light-bulbs, the electricity gets converted to heat, and the heat gets converted to light (part of it; a significant part gets converted to useless heat).Chemical energy from the battery gets converted to electricity; in the light-bulb, assuming the old-fashioned incandescent light-bulbs, the electricity gets converted to heat, and the heat gets converted to light (part of it; a significant part gets converted to useless heat).Chemical energy from the battery gets converted to electricity; in the light-bulb, assuming the old-fashioned incandescent light-bulbs, the electricity gets converted to heat, and the heat gets converted to light (part of it; a significant part gets converted to useless heat).
