Electrical Engineering

It wouldn't light up.

lower wattage bulb

Ammeters must be connected in series with the load. When connecting in parallel the meter appears as a short. If you open the meter, there's usually an 850ma fuse, and/or a 2A and 10A fuse that you can replace and fix the meter.

Ohms, Volts, Inductance, Capacitance, Frequency, etc are all measured in Parallel, Only amps are measured in series. This is why there's always a separate "red" terminal for amps that you have to switch the lead to, so you know to connect it in series.

If you're trying to measure the ampacity of something, E.G. "How many amps does this power supply put out? You'll need to rig up a load in series with the meter, large variable resistors which are carbon piles are commonly used to test the condition of automotive batteries and vehicle charging systems (alternators).

The single line diagram is circuit diagram where "one-line" is shown to represent three phases of a three phase power system. In addition to showing the ratings and size of electrical equipment and circuit conductors, a properly drawn one-line diagram will also show an electrically correct distribution of power with respect to current flow from the power source to the downstream loads or panelboards.

If the meter is sensitive enough and there is a resistance between the neutral and ground then the meter should be able to detect it.

by measuring the insulation resistance then by usig the formula for finding leakage current

leakage current =voltage applied /resistance measured by megger.

Thanks to a bit of research performed by Sir Humphry Davy for the British Navy, we have a technology known as "cathodic protection." First developed to keep the copper hulls of British naval ships from corroding, this technology has been applied to protecting everything from oilrigs to gas pipelines to telephony cabinets. By keeping the cabinet frame at a more positive voltage than ground, corrosion is reduced and the life of the equipment is increased. Who would have guessed?

the sum of the two

on top of battery

"Induction" motors imply AC power Most AC motors do not have brushes or commutator If your motor does have brushes, a lot of sparking where the brushes meet the comutator is a good indication that it needs to be cleaned and/or "cutdown". If your motor does not have brushes, then you have more serious trouble. Need more details

The system without feedback is known as open loop system. The examples of the open loop system are bread toaster, oven ,washing machine. The open loop systems are inaccurate & less complex.

multimeters generally measure volts Kohms milliamps VOM

LCR meters measure inductance capacitance and resistance

Q requires 2 at once and probably a frequency range you may care about

A: A DC adapter is basically like a battery except it is conditioned from an AC source. To change over measure the voltage when fully operational then switch to battery that have the same voltage as the adapter. the only concern should be the power required

Ohm's Law states Voltage = Current x Resistance. Hence if voltage is increased and resistance is constant, current will increase proportionally to the rise in voltage.

This type of compressor uses a special drive to control

The speed of the unit. Also, saves more energy than a fixed speed equivalent.

By increasing Vr,Reducing in series inductance,increase capacitance

It doesn't have to be rectified. That's the ONLY advantage; the electrical systems in all but the smallest planes are 400Hz AC systems.

All metals, liquid salt solutions, molten salts, and other certain substances are generally considered good electrical conductors. The best naturally occurring conductor is silver metal, although the next best thing is copper, since it's much cheaper and more widely available. If you have access to extreme cryogenic cooling mediums like liquid helium or liquid nitrogen, you can cause certain metals and compounds to become superconductive; i,e. perfect conductors.

Hi-pot and megger tests are common to check the insulation on transformers, motors, refrigeration compressors, etc. They help check the condition of equipment to avoid a future falure. High votage test are conducted in current transformers by shorting the seconday and earth,can apply 3 times the rated voltage

When a LED is multiplexed, it is energized not all the time, but only for short periods. Let's say it's in a row of three - this would mean it's only on for 33% of the time. If the current remains the same, it's only 33% as bright. By increasing the current, you make it look as bright as if it were on all the time, even though it isn't. This "pulse current" is thus higher than the normal maximum; because it's only applied for such short periods, it will not damage the LED.