Motor Efficiency Practical - Physics - 1550 Words

Stage 1 Physics – Practical Aim: To calculate the weight limit held and the efficiency of an electric motor. Method: 1.) With all materials gathered, start by plugging the Power Supply Unit (PSU) into a free plug, making sure the PSU is switched to 6V. 2.) Attach the Crocodile clips from the PSU to the ammeter and motor as shown above in the labelled diagram, making sure the voltmeters clips are attached to the motor. 3.) Starting with 20g of weight attached to the string on the motor (as seen above) perform 3 experiments with each weight group (20g, 40g, 60g, 80g) and record their voltage, time and current. 4.) Have one person reading the ammeter, one person timing the weights reaching the top of the motor, and the†¦show more content†¦There are many sources of error that shouldn’t be ignored throughout this practical exercise. Stick to the safety instructions to ensure maximum protection to both the devices and the students. Analysis and Evaluation: (real life motor efficiency situations) The initial task was aimed to test whether the motor could life a range of valued weights between 20 grams and 100 grams. Whilst testing the motors capacity to hold certain weights, an input and an output formula were used to calculate the efficiency of the motor. This was relative to the Voltage, Current, time, gravity, height (string off the ground) and the mass of the weights. Fortunately each of the three sets of four given weights was successfully lifted by the motor across a variation of times. This data also changed the readings on the voltmeters and ammeters. The results that were calculated along with the efficiencies were both successful and astounding to come across especially as the graphs trend above goes up and down, rather than in a single direction. On a larger scale, the example of a Lego made motors efficiency can relate to that of a modern day car and the efficiency / energy waste that comes from it. 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