electronic components
safety
measuring devices
units and their equivalent quantities
motors
100
It opens or closes a circuit.
What is a switch?
100
Disconnect from the mains. Secure against reconnection. Verify that the system is dead. Carry out earthing and short circuiting. Provide protection from adjacent live parts.
What are the five safety rules?
100
It is an electronic measuring instrument that combines several measurement functions in one unit. A typical device can measure voltage, current, and resistance. Analog ones use a microammeter with a moving pointer to display readings. Digital ones have a numeric display, and may also show a graphical bar representing the measured value.
What is a multimeter?
100
Its base unit is ampere.
What is electric current?
100
It is a brushless DC electric motor that divides a full rotation into a number of equal steps. The motor's position can then be commanded to move and hold at one of these steps without any position sensor for feedback (an open-loop controller), as long as the motor is carefully sized to the application in respect to torque and speed.
What is stepper motor?
200
It can be used to reduce the available voltage or current present in a circuit.
What is a resistor?
200
They usually enclose or protect the area surrounding the eye in order to prevent particulates, water or chemicals from striking the eyes. They are often worn when using power tools such as drills or chainsaws to prevent flying particles from damaging the eyes.
What are safety goggles?
200
It is an electrical instrument that measures electrical resistance, the opposition to an electric current. Depending on the type it can make low resistance measurements or measure large values of resistance.
What is an ohmmeter?
200
Its base unit is ohm.
What is electrical resistance?
200
It is a rotary actuator or linear actuator that allows for precise control of angular or linear position, velocity and acceleration. It consists of a suitable motor coupled to a sensor for position feedback. It also requires a relatively sophisticated controller, often a dedicated module designed specifically. They are not a specific class of motor although the term is often used to refer to a motor suitable for use in a closed-loop control system. They are used in applications such as robotics, CNC machinery or automated manufacturing.
What is a servomotor?
300
It consists of three layers separated by a semi-conductor material. There are two types: NPN and PNP. Both types perform the same function, however they are different in polarity. It can be used as switch or amplifier.
What is a bipolar transistor?
300
It is the assistance given to any person suffering a sudden illness or injury, with care provided to preserve life, prevent the condition from worsening, or to promote recovery. It includes initial intervention in a serious condition prior to professional medical help being available, such as performing cardiopulmonary resuscitation while awaiting an ambulance, as well as the complete treatment of minor conditions, such as applying a plaster to a cut.
What is First Aid?
300
It is a measuring instrument used to measure the current in a circuit. The majority of these devices are either connected in series with the circuit carrying the current to be measured, or have their shunt resistors (Nebenschlusswiderstand) connected similarly in series. In either case, the current passes through the meter or (mostly) through its shunt.
What is an ammeter?
300
Its base unit is henry.
What is inductance?
300
It is an electric motor driven by a specific current. It commonly consists of two basic parts, an outside stator having coils to produce a rotating magnetic field, and an inside rotor attached to the output shaft producing a second rotating magnetic field. The rotor magnetic field may be produced by permanent magnets, reluctance saliency, or electrical windings.
What is an AC motor?
400
It is the basic building block for most semiconductor devices. It is part of the bipolar family of devices. It consists of two semiconductor materials, one doped with a lack of electrons called p-type material, and the other side is doped with a surplus of electrons called n-type material. Its main function is to block the current in one direction, and allow current to flow in the other direction.
What is a diode?
400
It is a device that instantly breaks an electric circuit to prevent serious harm from an ongoing electric shock. These electrical wiring devices are designed to quickly and automatically disconnect a circuit when it detects that the electric current is not balanced between the energized (line) conductor(s) and the return (neutral) conductor.
What is an RCD?
400
It is an instrument used for measuring electrical potential difference between two points in an electric circuit. Analog one move a pointer across a scale in proportion to the voltage of the circuit; digital ones give a numerical display of voltage by use of an analog to digital converter.
What is a voltmeter?
400
Its base unit is farad.
What is capacitance?
400
It is any of a class of rotary electrical machines that converts a specific current electrical energy into mechanical energy. The most common types rely on the forces produced by magnetic fields. Nearly all types of them have some internal mechanism, either electromechanical or electronic, to periodically change the direction of current flow in part of the motor. They were the first type widely used, since they could be powered from existing lighting power distribution systems. Small motors are used in tools, toys, and appliances.
What is a DC motor?
500
It is an electrical device that converts alternating current, which periodically reverses direction, to direct current, which flows in only one direction. So it "straightens" the direction of current.
What is a rectifier?
500
It is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overcurrent, typically resulting from an overload or short circuit. Its basic function is to interrupt current flow after a fault is detected. Unlike a fuse, which operates once and then must be replaced, it can be reset (either manually or automatically) to resume normal operation.
What is a circuit breaker?
500
It is a type of electronic test instrument that allows observation of varying signal voltages, usually as a two-dimensional plot of one or more signals as a function of time. Other signals (such as sound or vibration) can be converted to voltages and displayed. It is used to observe the change of an electrical signal over time, such that voltage and time describe a shape which is continuously graphed against a calibrated scale. The observed waveform can be analyzed for such properties as amplitude, frequency, rise time, time interval, distortion and others.
What is an oscilloscope?
500
Its base unit is coulomb.
What is electric charge?
500
In such a device, the expansion of the high-temperature and high-pressure gases applies direct force to some component of the engine. The force is applied typically to pistons, turbine blades, rotor or a nozzle. This force moves the component over a distance, transforming chemical energy into useful mechanical energy.
What is a /(an internal) combustion engine?
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