Electrical Engineering

Connect the circuit to the appropriate size circuit breaker to meet the required amperage of the circuit. Turn the breaker on and use the circuit. Unless the circuit is of a very high ampacity, plus 200 amps, don't worry about voltage drop over 50 feet.

You need to multiply the number of coulombs by the number of volts. If the two batteries are in series, then you can add the voltage of both batteries.

A power lead (is a cable) that connects the mains electrical supply to an electronic device. An example is the cable from a computer to the socket in the wall. Obviously, a washing machine (and most household appliances) need power leads too.

You do not need to use an external variable frequency drive for the said AC. You have mentioned that it is inverter AC. It means the AC is already fitted with a built in inverter.

Even if you connect an inverter to the AC, you need another control device to control the VFD to control the speed of the fan/ compressor depending upon the room condition, external temperature, temperature setting etc. It is little complicated.

Fire alarm system may be having some electronic devices and cards, in which some capacitors are used. Capacitors are part of any electronic cards.

The difference between current transformer and potential transformer is that the secondary of a current transformer can not be open circuited while under service whereas that of the potential transformer an be open circuited without any damage to the transformer.

It does not depend on the line. The regulation is the percentage change in voltage caused by applying the full load current, and that depends on the transformer supplying the line. A value of 5% would be typical.

If a fuse melts, it creates an OPEN circuit, meaning that no current flows in the wires because it is no longer a complete circuit.

For calculation purposes 1 HP is equal to 746 watts. So you have a total of 746 x 7 = 5222 watts. The amperage will be A = W/V = 7222/12 = 435 amps. You can not start the motor directly off of the solar panel. You would need a large 12 VDC parallel connected battery bank to obtain the amperage capacity to start the motor. The solar panels would be connected to the battery bank and used to charge the batteries after the start.

Dual supply arrangement allows for the output voltage to swing both above and below zero volts, and also gives an output of 0V when there is no voltage difference between the two inputs. An op amp can only amplify a signal to its values in the supplied range. If you want to amplify a signal with negative values then you need a negative supply.

This type of motor starting configuration is used to start large motors. The utility company's policy is to only let a certain three phase motor horsepower loads across the line starting. High horsepower loads draw high current which draws the line voltage down. This causes a small instantaneous brown out to which the utility company gets complaints about. To solve this problem, limit the horsepower load. Starting a delta motor in star configuration reduces the inrush current because the voltage applied to the motor is lower. This technology is rapidly becoming old due to the new type of motor controllers on the market. Replacing the star delta starters is soft start controllers. The inrush current can be controlled so as to not make any voltage drop on the line. These controllers are different from VFD's which are expensive for this type of application. The main function of the soft start is to get the motor on line without any line disturbances.

Voltage regulators that are adjustable are common, for example the LM338, which can pass up to 5 amps with a suitable heat sink, and the output voltage is set by two external resistors connected to the regulator. A variable resistor can be used to make the output voltage directly adjustable.

A magnetic core made of iron laminations, forming a closed loop, and two or more coils of copper wire wound to intersect the core.

No, it opens the circuit so that no current flows.

Depends on the volts and amps it's pushing. For instance. Connect three 12 volt car batteries in series and you will feel it. Three double A's however, no.

No, but your spit may touch a contact and the shock could kill you. So don't even think about doing such a stupid thing!

Your best plan is to make sure not to get electrocuted because it can be very dangerous.

A single-phase motor provides a torque which pulsates at double the supply frequency. The effect is reduced by the moment of inertia of the rotating parts of the motor. If it is still excessive for a particular application, a flywheel can be placed on the shaft.

In a series DC motor used for traction, the armature rheostat is there to limit the current on starting. In normal running the rheostat is set to zero ohms (maximum power) so that power is not wasted in it. At full speed the power is turned off, the vehicle then coasts along until it's time to stop.

AC source of electric power changes changes polarity constantly, in amplitude.

Yes, ball sparks gaps is the official way to calculate the breakdown voltage of air at specific temperatures pressures and humidity over a distance.

A transformer's 'nameplate' lists all the data necessary to identify the rating, connections, etc., of a transformer. Part of this data is the 'vector group' information which applies to three-phase transformers, and which, in simple terms, tells us whether or not the transformer can be connected in parallel with another.

There are multiple types of frequency inverters/drivers offered by AC Tech. To name a few: The General Purpose Frequency Drive, IP20; the vector drive plus and the modbus. These three come in various forms and specs.

A relay is not essential but larger motors have a relay which operates above a certain speed, to cut out the start capacitor, which improves the power factor and reduces power losses.