EEE lab manual & readings calculator
Every experiment written out the way a record is written — aim, apparatus, theory, connections, procedure, precautions, sources of error and viva questions with answers. Then the part no manual gives you: type in your meter readings and it fills the tabular column, works the calculation through, plots the characteristic and tells you when a reading cannot physically be right.
What the readings calculator does
- Fills your tabular column. One computed row per reading set — slip, torque, power factor, efficiency, whatever that experiment needs — ready to copy into the record.
- Shows the working. Formula, substitution and result for one row, so you can write the calculation out by hand the way the examiner wants it.
- Draws the characteristic. The curve the record asks for, plotted from the same numbers as the table.
- Catches impossible readings. Efficiency over 100 %, a speed above synchronous, a power factor above 1, R greater than Z — each named, with the meter or connection that usually causes it.
It all runs in your browser. Your readings never leave the device, and the page keeps working with the network off.
Transformers and Generators lab
Open-circuit and short-circuit test on a single-phase transformer
To conduct open-circuit and short-circuit tests on a single-phase transformer, determine its equivalent circuit parameters, and predetermine efficiency and regulation at any load and power factor.
Load test on a single-phase transformer
To conduct a direct load test on a single-phase transformer and determine its efficiency and voltage regulation at various loads.
Regulation of a three-phase alternator by the EMF (synchronous impedance) method
To determine the voltage regulation of a three-phase alternator at a given load power factor by the EMF (synchronous impedance) method, using open-circuit and short-circuit test data.
Electric Motors lab
Swinburne's test on a DC shunt machine
To conduct Swinburne's test on a DC shunt machine and predetermine its efficiency when running as a motor and as a generator, without loading the machine.
Load test on a three-phase squirrel-cage induction motor
To conduct a load test on a three-phase squirrel-cage induction motor using a brake drum, and to draw its performance characteristics — efficiency, slip, torque and power factor against output power.
Open-circuit characteristic of a DC shunt generator
To obtain the open-circuit characteristic (no-load magnetisation curve) of a DC shunt generator at constant speed, and from it determine the critical field resistance and the critical speed.
Speed control of a DC shunt motor by armature voltage control
To control the speed of a DC shunt motor by varying the armature voltage at constant field current, and to verify that speed is proportional to back emf.
Basic Electrical lab
Measurement of three-phase power and power factor by the two-wattmeter method
To measure the power and power factor of a three-phase balanced load using two wattmeters, and to verify that the sum of the two readings gives the total three-phase power.
Verification of Ohm's law and series–parallel resistance
To verify Ohm's law by measuring the current through a resistor at several applied voltages, and to confirm that the ratio V/I is constant and equal to the marked resistance within tolerance.
Basic Electrical / Electric Circuit Analysis lab
Before you write the record
The readings in a record have to be the ones you actually took. Every calculator here starts empty for that reason — the sample set is a button, not a default, and it is there so you can see what the page does before you own any numbers of your own. What the page is genuinely good for is catching the reading you wrote down wrong while you are still standing at the bench and can take it again.