0
For what purpose do you short circuit the main and common terminal in a wattmeter?
Wiki User
∙ 11y ago
A wattmeter has two coils: a current coil, which must be connected in series with a load, and a voltage coil, which must be connected in parallel with the supply voltage. Accordingly, a wattmeter has four terminals: two for each coil. One terminal of each coil needs to be connected to the line (as opposed to neutral) conductor and, so, these terminals are connected together. Having said that, this is not absolutely necessary, and the two coils can be connected quite separately. Basically, how the two coils are connected comes down to the configuration of the load whose power is being measured.
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
Is base emitter circuit and common base amplifier same?
No the base emitter circuit is not the same as a common base circuit. The three BJT circuits all have the base emitter circuit. Wheter each terminal is common to both inputs and outputs of the circuit determines the type of transistor configuration.Henry Lee Everson PE;229-560-9769
What does common mean in terms of wiring IE hot neutral ground line NO NC?
In terms of hot,neutral,ground, the neutral is classed as the common. In regards to a switch which has a NO, NC, C. This is classed as a C form switch. It has a common terminal, a normally open terminal and a normally closed terminal. Depending on the position of the switch handle the circuit can be either open or closed.
What is single tuned voltage amplifier?
it is a circuit consisting of a tuned circuit with a capacitor in parallel with inductor and it is connected to collector terminal in common emitter configuration,, and it is used as frequency receiver
What is the purpose of a relay in an electric circuit?
A electrical relay device is usually a small electro-mechanical switch which, when energized, will close a contact-set to complete another circuit. A relay is used regularly by people who drive motor vehicles: the key switch (ignition switch) is turned to "Start" and 12 volts (approximately) is applied to the "starter solenoid" (which is actually a big relay). The solenoid's coil is energized - drawing only one to five amps or so from the battery - and it closes its high-current-carrying contacts so that the battery voltage is delivered to the starter motor, which usually draws around 100 amps or more... If you didn't have that starter solenoid to do the job for you, to turn on that kind of current using only your ignition key you'd have to turn a very large key to turn a very big, heavy - and ugly! - switch on your steering column... There are variations on this theme to which the term "relay" can be applied, but the idea remains the same: a small switch of some kind controls another (usually higher voltage and/or current) circuit. ________________________ A relay is a switch as the previous contributor described; however, it does not necessarily control a higher voltage circuit. Relays are also commonly used in low power applications to switch a signal to one or more circuits. The common terminal of a relay is typically used as the input, and the throw describes the number of switches that are connected ("thrown") at the same time. A relay is controlled by a solenoid. When the proper voltage is applied across the solenoid, the relay energizes, which activates the throw and the common terminals are connected to the Normally Closed (N/C) terminals. When no voltage is applied across the solenoid, the relay is unenergized and the common terminals are connected to the Normally Open (N/O) terminals of the relay. Some common relays are: SPST: Single pole single throw - has a single common and single output. The unenergized position is N/O because the signal at the common terminal is not present at the output until the relay is energized. Once the relay is energized, the input signal at the common terminal is connected to the output at the N/C terminal. This type of relay is used to connect a single common terminal to a single output terminal. SPDT: Single pole double throw - has a single common and two outputs. In the unenergized position, the common terminal is connected to the N/O terminal. Once the relay is energized, the signal at the common terminal is connected to the N/C terminal. This type of relay is used to connect a single common terminal to one of two output terminals. DPST: Double pole single throw - has two common inputs and two outputs. This type of relay is electrically equivalent to two SPST relays that operate simultaneously. In the unenergized state, the two common terminals (C1 and C2) are not present at either output terminal. In the energized state, C1 and C2 are switched to their respective output terminal at the same time. DPDT: Double pole double throw - has two common inputs and four outputs. This type of relay is electrically equivalent to two SPDT relays that operate simultaneously. In the unenergized state, the two common terminals (C1 and C2) are present at the NO terminals (NO1 and NO2) of the relay. When the relay is energized, C1 and C2 are switched to the N/C terminals (NC1 and NC2) at the same time.
Explain the Two wattmeter method of power measurement in a 3 phase circuit?
A single wattmeter can measure power due to one phase only. But circuit arrangements , popularly called: 1) 2-wattmeter method (requiring two wattmeters) 2)3-wattmeter method (requiring 3 wattmeters) can be used for measuring power inn 3-phase circuit. The details of these method can be found in any standard book on electrical engineering.
Wiring off road lights?
I would wire them using a common relay and a ground switched circuit i.e. Terminal #30 Hot Terminal #87 Load Terminal #85 Hot Terminal #86 Switched to Ground
Is base emitter circuit and common base amplifier same?
No the base emitter circuit is not the same as a common base circuit. The three BJT circuits all have the base emitter circuit. Wheter each terminal is common to both inputs and outputs of the circuit determines the type of transistor configuration.Henry Lee Everson PE;229-560-9769
DC voltage has no polarity?
A DC voltage must have a polarity, however this polarity is always in reference to some common point and has no meaning on its own, the same with voltage. Usually this common point is the circuit ground, which may or may not be earth ground. Example: A household AA battery has a positive and a negative terminal, the positive terminal is +1.5v in relation to the negative terminal, and the negative terminal is -1.5v to the positive terminal.
What is cascade tripping?
It's when a failure of one circuit leads to another circuit to fail. This can be intentional,for protection purpose, or it may not be intentional. Cascade tripping is common in sequenced circuit.
What does common mean in terms of wiring IE hot neutral ground line NO NC?
In terms of hot,neutral,ground, the neutral is classed as the common. In regards to a switch which has a NO, NC, C. This is classed as a C form switch. It has a common terminal, a normally open terminal and a normally closed terminal. Depending on the position of the switch handle the circuit can be either open or closed.
What is a v out?
"Vout" typically refers to the output voltage of a circuit or device. It is the voltage level that is generated or present at the output terminal or node of the circuit. Voltage output is a common measurement parameter in electronics and electrical engineering.
How do you wire a circuit to close only when two other circuits are both closed?
You could probably use 2 common relays: 1st relay would be powered up by closing circuit no. 1 using the coil of the relay 2nd relay would be powered by the 1st for the function of the circuit in question both circuits would have to be closed before the 3rd circuit would close and function I thought of a much simplier way to solve your problem. Get a cooling fan relay at Auto Zone Part no. 19899 $15.99 and wire as follows: Terminal No. 85 power up when circuit No. 1 is activated (turned on) Terminal No. 86 Ground Terminal No. 87 power up when circuit No.2 is activated Terminal No. 30 Load of circuit No. 3 (the one you want to control) I think this will work for you
What M L C V indicates in wattmeter?
mains common load voltage (M C L V)
Can you wire a standard on and off switch into an already existing circuit so that the off position completes the old circuit and the on position routes a new circuit?
A standard switch opens the circuit when in the off position, so the answer to your question is no. That said there is a way that it can be done by changing the switch to a single pole double throw switch. The "hot" will come into the switch on the common terminal. The old circuit connects to the top switch handle up terminal. The new circuit connects to the terminal in the handle down position. This setup will leave one of the circuits on all of the time. To over come this situation the switches can be installed in a double gang box. A standard on off switch will control the power to the "hot " that comes into the SPDT switch.
What is single tuned voltage amplifier?
it is a circuit consisting of a tuned circuit with a capacitor in parallel with inductor and it is connected to collector terminal in common emitter configuration,, and it is used as frequency receiver
What does common mean on a light switch?
On a single pole single throw there is no common terminal. On a single pole double throw it is the terminal that is common to both the top and bottom terminals. The "hot" wire is connected to the common terminal so that when the switch is in the up position that terminal becomes energized and there will be no no voltage on the bottom terminal. When the switch is in the down position the bottom terminal becomes energized and there will be no voltage on the top terminal. In relays thisis known as a C form configuration.
How does emergency light switch work?
An emergency light switch uses a relay. A relay has an 5 terminals. The firs two terminals are connected to a flowing current (current flows when there is a normal electricity) The next 3 terminals are the common, the normally on, and normally off. One of the battery terminal is connected to the common, and the other one terminal of the battery is connected to one terminal of the light bulb(which has two terminals) then the other terminal of the light bulb is connected to the normally on terminal of the relay. When current flows to the first two mentioned terminals of the relay, the circuit of the battery and light is cut off or not connected. But when the current is off, this will switch on the normally-on terminal thus current will flow from the battery to the light bulb, that will shed light. ;) on an emergency situation. note: The normally off is not use. And may be use for some purpose.
