0
How would you measure voltage passing through a light bulb using a digital multimeter?
Wiki User
∙ 14y ago
Simply set the multi meter on DC voltage, which is denoted by a line with dotted lines under it. Then place the red lead on the positive side of the bulb and the black lead on the negative side. If you do this incorrectly it will be a negative number but the same number if the leads are reversed.
If you have a bad bulb the meter will show all zero´s. Otherwise you´ll get something like 0.01 which is a good indicator for a working bulb.
The voltage across the light bulb will be the same voltage as the supply. Regardless of whether the bulb is good or bad the voltage potential will still be there. You are measuring voltage not amperage.
Wiki User
∙ 8y ago
Wiki User
∙ 14y agoA multimeter does not measure voltage. A voltmeter measures voltage. It might be part of another meter and contained within another meter, but it is still a voltmeter. The simplest way is to use an old mechanical volt meter. This uses a galvinometer and a known resistance. You attach one contact of the galvinometer to the resistor and one to either the positive or negative terminal. Then you attach the other end of the resistor to the other terminal. The galvinometer then goes to one the high side when connected and drops to zero when not connected. (Direct current is the easiest and where we start. You get to ways to use diodes and transistors later after you understand the basics. The principles remain the same.)
Wiki User
∙ 14y agoVoltage does not pass through a light bulb - current does. Voltage exists across the light bulb. Knowing that, to measure the voltage across a light bulb with a voltmeter, place the voltmeter across the light bulb.
Wiki User
∙ 13y agoA DC voltage can be read with a VOM (volt ohm meter).
Add your answer:
Earn +20 pts
Why multimeter cannot used for measurement of insulation resistance?
Because ordinary ohmmeters are calibrated to measure a range of resistance values that are significantly lower than the resistance of insulation. It should also be realised that we usually test insulation resistance while subjecting the insulation to a high electric field, which a normal ohmmeter is incapable of producing.
Can you measure the internal resistance of dry cell using multimeter?
Well, you do use a multimeter to measure it, but not directly. You need at least one other thing besides the multimeter and the dry cell. Here's a simple way to do it: -- Take a resistor. With the meter set to measure resistance, measure the resistor's value. Call that 'R'. -- With the meter set to measure voltage, measure the voltage of the dry cell. Call it 'V1'. -- Connect the resistor across the dry cell. Measure the dry cell's voltage again. Call it 'V2 ' this time . V2 will be less than V1 . The internal resistance of the dry cell is R times (V1 - V2) / V2
What is a DC ammeter and how does a DC ammeter work?
An ammeter is an instrument designed to measure electric current, which is expressed in amperes. A d.c. ammeter is one that will measure direct current (d.c.), as opposed to alternating current (a.c.). Ammeters are rarely used outside laboratories. Instead, multimeters are more commonly-used, and these will measure d.c. or a.c current and voltage, together with resistance. In other words, a multimeter functions as an ammeter, a voltmeter, and an ohmmeter. The principle of operation of a digital ammeter is too complicated to explain in this forum. An analogue ammeter works by a rotating coil to which is attached a pointer. The coil is balanced between two hairsprings and located between opposite faces of a permanent magnet. When current passes through the coil, the resulting magnetic field reacts with the permanent magnetic field, causing the coil to rotate, tightening the hairsprings. When the torque due to the current matches the opposing torque due to the hairsprings, the coil will stop turning. The position of the pointer on a scale will then indicate the current passing through the ammeter.
How To Measure Electrical Resistance?
If you put a current of 1 amp through a resistor, the voltage across it is equal to the resistance in ohms. This can also be done with lower currents and then the result must be multiplied up in the right ratio. An ohmmeter, or the ohm scale on a multimeter, uses a battery to supply the current.
Does an ammeter measure current?
An ammeter measures the amount of current flowing through an electrical circuit. It measures amperage.
How do you know when a wire has current flowing through it?
You can measure with a multimeter. Alternately, you can check for a magnetic field around the wire.You can measure with a multimeter. Alternately, you can check for a magnetic field around the wire.You can measure with a multimeter. Alternately, you can check for a magnetic field around the wire.You can measure with a multimeter. Alternately, you can check for a magnetic field around the wire.
What is the principle of digital multimeter?
A: A VOM digital requires to have a ADC analogue to digital converter whereby the analogue input will be displayed as number representation. An analogue meter all it requires is to have is current flow through it.
Multimeter that can measure inductance capacitance frequency voltage current and resistance in one system?
Many mutlimeters have this capability. You'll probably want a digital multimeter. If you do a good search, this should be easy to find. You'll need to read through the specifications carefully to make sure you find one that gives the level of accuracy you're looking for. the more accurate it is, the more you'll pay.
Why galvanometer is connected in wheatstone bridge?
A Wheatstone Bridge is used to measure resistance of an electrical / electronic component. The galvanometer (which was used to measure voltage) has now been replaced by the Multimeter.Both are not used today.AnswerA Wheatstone Bridge has most definitely NOT been replaced by a multimeter! It uses a completely-different method of measuring resistance and is significantly more accurate than a multimeter. The purpose of the very sensitive galvanometer is to detect when the Bridge circuit is 'balanced', by sensing the current (not voltage!) passing through it. When no current flows, the Bridge is balanced.
How do you check amp draw?
Amperage is measured by a multimeter. First determine the amperage rating on the multimeter. Next, select the appropriate setting on the tool. The next step is to set the range on the multimeter. Make sure to plug the leads into the appropriate terminals. Run the circuit through the multimeter to measure the current. Turn off the breaker, make sure the AC circuit is turned off, then rewire the circuit.
Why multimeter cannot used for measurement of insulation resistance?
Because ordinary ohmmeters are calibrated to measure a range of resistance values that are significantly lower than the resistance of insulation. It should also be realised that we usually test insulation resistance while subjecting the insulation to a high electric field, which a normal ohmmeter is incapable of producing.
Which is the best multimeter where we can find that how to use a multimeter to check resistance and voltage?
As far as best multimeter is concerned, you can find them through some quality blogs. First you have to focus on requirements yo needs. For example you may find through meterreviews
How can you measure a time delay fuse with a multimeter to determine if it is good or bad?
Set the multimeter for the "buzz" mode. This mode checks for electrical continuity. This means that the multimeter checks to see if there is a path for electricity to pass through. Some multimeters indicate it with a buzz, others with a light. Put one lead at either end of the fuse, and if the indicator (buzz or light) goes off, the fuse is good. If it doesn't go off, the fuse is broken. If you don't know how to set your multimeter on that setting, or it does not have one, set the multimeter to measure resistance. If the fuse measures a really small resistance, it is good. If it measures at a really large resistance, it is broken.
Why you cannot measure the resistance of a resistor when there is current passing through it?
you can if you know the current measure the voltage across the resistor E=I*R there is actually no way to measure the resistance without passing current thru it P=I*E E=I*R any 2 will give you the other 2
Can you measure the internal resistance of dry cell using multimeter?
Well, you do use a multimeter to measure it, but not directly. You need at least one other thing besides the multimeter and the dry cell. Here's a simple way to do it: -- Take a resistor. With the meter set to measure resistance, measure the resistor's value. Call that 'R'. -- With the meter set to measure voltage, measure the voltage of the dry cell. Call it 'V1'. -- Connect the resistor across the dry cell. Measure the dry cell's voltage again. Call it 'V2 ' this time . V2 will be less than V1 . The internal resistance of the dry cell is R times (V1 - V2) / V2
A circuit must be physically interrupted to measure?
This is a tough question to answer because you've forgotten to include WHAT electrical property you're trying to measure. If you are trying to measure current through a closed, complete circuit with a multimeter, then yes. You must physically disconnect the circuit at the point you wish to measure, and then re-complete the circuit by connecting the leads of your multimeter to the points you just disconnected. (Please be sure the circuit is not energized before you disconnect the circuit!) If you are trying to measure a voltage difference, then no. Just place the leads of your multimeter on the two points you wish to measure the voltage between. As always when dealing with electricity, its safety first. Please do everything you can to protect yourself from electrical shock, especially if you're dealing with 120V/240V line voltages in a house.
When a multimeter is set to measure resistance?
it determines how well the current flows through the wires. ANSWER: When there is no outside power connected to it. But some power is necessary to read the resistance so the meter battery will supply the current necessary to measure the IR drop and translate that to resistance
