A tachometer is specifically designed to measure the rotational speed of a machine, including DC machines.
Voltmeter: measures voltage (electrical potential difference).
Ammeter: measures current.
Multimeter: measures multiple electrical quantities, including voltage, current, and resistance.
Manometer: measures pressure.
The back EMF in a DC motor opposes the supply voltage. This is explained by _____________.
Which of the following statements related to the speed control of DC shunt and series motors is correct?
In a brake test, the DC motor took 20 A from a 200 V supply mains. The brake pulley of radius 10 cm had an effective load of 20 kg and the speed was 10 rps. The value of BHP (in metric) is _________.
