Electrical Engineering

First, the amps drawn will be different depending on the supply voltage. You do not say which yours is - 208? 460? 4,160? Second, manufacturers normally give two different current figures, one for the motor running with full load, and one for 'locked rotor'. Locked rotor current is the very high current drawn when power has been applied, but the motor has not had time to start spinning. No one that I know of publishes 'current at no load' for their motors. Since a motor with no load is not doing anything useful, no one really cares how much current is being drawn. It's kind of like putting your car up on a jack so the wheels are off the ground and asking how much fuel will the car burn sitting still with the wheels turning at 50 miles an hour! Also, since a three phase motor does not have a neutral connection, it is, in effect, always delta connected. Delta and wye connections have the same voltage and phase characteristics IF you do not have a neutral. The motor cannot tell the difference.

There are no disadvantages to the use of parallel circuits in houses. As the rated power of any appliance is dependent upon it operating at its rated voltage, then a parallel connection is the only method of achieving this. Furthermore, in the case of lighting circuits, for example, should one lamp fail, the parallel connection ensures that the remaining lamps will continue to work normally.

Typical limit on equipment is 5 uAmps, but you can actually fail testing on a unit that has greater leakage current inherent to design. 1)Limit (usually on the order of kilomegohms) to design or build for depends on the UL, ANSI, or Military spec that is usually called out by a customer. 2)Measured value with DC Megohmeter to look for depends on size of the part, and resistivity of the insulation materials. Resistance between isolated windings will be defined as (area of interface) divided by (thickness of insulators) x resistivity of insulator. Resistivity is normally a listed mfgr value.

A: Definitely NOT it must follow its linear load region a close loop of approaching infinity will certainly be inclined to be not stable

In Indian context how much kW equals to one ton (refrigeration)

An 'earth pit', is a pit in which connection is made between the earthing (grounding) electrodes that have been hammered into (or laid into) the soil, and the earthing conductor that connects the electrical installation to those earthing electrodes.

The SI unit of measurement is the ampere (symbol: A) is defined as, 'the constant current that, if maintained in two straight parallel conductors of infinite length and negligible cross-sectional area and placed one metre apart in a vacuum, would produce between them a force equal to 2 × 10-7 newtons per unit length'.

Short circuit voltage is the voltage that has to be applied to the primaries of a transformer, so that the nominal current flows through the secondaries, when they are shorted. This value is important, if transformer secondaries shall be used in parallel. Ideally all transformers with parallel secondaries should have the same short circuit voltage. When their short circuit voltages are different, the transformer with the lower short circuit voltage will be loaded more than their relationship of power ratings would predict. The short circuit voltage is also important in the design of a transformer, because it predicts, how much the secondary voltage will drop at nominal output current. This knowledge helps the designer to find out, how many further windings the secondary needs for a certain voltage in relation to an ideal transformer. Short circuit voltage is also known as impedance voltage.

none the energy is in the amps

The milli-amp-hours rating has nothing to do with the voltage. The rating should be something like 3000 mah at 12V or 3000 mah at 1.5V.

One common 3000 mAh battery is 3.0 volts; another is 3.7 volts. A common camcorder battery is 7.4 volts. Some DeWalt tools use 12 V 3000 mAh batteries.

The load current is made to flow through the thermal overload relay, which is actually a bimetalic strip. Beyond a prespecified current the bimetalic strip tend to deflect due to heat (thermal effect) thus cutting off the circuit and hence it acts as an over load relay protection.

When a dc supply is connected to a resistor, current flows.

The current in amps is equal to the supply voltage divided by the resistance in ohms.

The power used is the voltage times the current, and that appears as heat in the resistor, which might become hot to touch.

A transformer that increases voltage is a step-up transformer.

If the fan motor says 220 230 240 they will all work on those voltages The rating are important The higher the voltage, the amps will be lower=cheaper to run Same goes for frequency( hz ) the higher number runs faster U can use a higher rated hz on a lower hz it will run slower than normal U cannot always do the reverse especially dealing with hz and voltage Your application will work safely but look at motor nameplate it might be rated for multiple voltages and frequencies Also the motor will detriorate a little bit faster when u use 230v on something designed for excalty 220v but this is still safe

The most obvious difference is their purpose. A CT is used to provide power system measurements to instrumentation - such as relays and metering equipment. These are typically designed to provide 1-5 amps in their secondary sides. A distribution transformer is used to provide power to costumers. These are designed to provide much higher current.

CT's are designed to give a ratio of the primary current to the secondary - not specifically the same voltage. Due to this the voltage on the secondary side will vary depending on load (from a few volts to saturation level voltages). Distribution transformers provide a constant voltage at a varying current level.

there are other differences as well - size, insulation, primary connection, etc.

An 'ohmic' resistor is one which obeys Ohm's Law. For Ohm's Law to apply, the resistance of a circuit must be constant over the range of incremental voltages applied to it. If the resistance changes over an incremental range of voltages, then it is said to be 'non-ohmic', and it does not obey Ohm's Law.

secret.........

They are proportional..

induction motors have very little starting torque

as the motor come up to speed it reduces the torque load until it gets near synchronous speed

A rectifier converts from AC to DC power by blocking one half of the AC current. A full-wave bridge rectifier is actually 4 rectifiers combined in such a way that it reverses the blocked half of the power, allowing it to flow through.

A standard power supply consists of a transformer (for voltage changes), a rectifier, and additional components for cleaner power (e.g., filters to smooth out the waves of AC power, voltage regulator, etc.).

100meter

A 'polarity test', as it applies to a switch, is performed to confirm that the switch is located in the line conductor and not in the neutral conductor.