Motor efficiency practical physics

Measuring energy transfers

In the photograph, the core is laminated soft iron. These ends will be both the axle and the contacts.

Electric motor

If a soundwave moves the diaphragm, the coil will move in the field, generating a voltage. For example poke holes in a soft drink cans with a nail as shown.

You measure the rise in temperature of the material, and how much of it is warmed up. For advantages and disadvantages of permanent magnet versus wound stators, see below.

When you drive such a motor with AC, the current in the coil changes twice in each cycle in addition to changes from the brushesbut the polarity of the stators changes at the same time, so these changes cancel out. Note that this motor has at least one 'dead spot': This gives a field rotating counterclockwise.

This is a nice project: For students who know vector multiplicationit is easy to use the Lorentz force directly: In the primary circuit: The coil moves in the field of a permanent magnet, which is usually shaped to produce maximum force on the coil. Please remember my warning about the idealised geometry: If you raise 1 kg through a height of 1 m every second requiring 1 mini-snack per second then this is about 10 grams of sugar per hour.

Electric motors and generators

Work is done when an applied force causes something to move in the direction of the force. For instance, a typical DC motor is likely to have many separately wound coils to produce smoother torque: The Hadley circulation is identified with rising of warm and moist air in the equatorial region with descent of colder air in the subtropics corresponding to a thermally driven direct circulation, with consequent net production of kinetic energy.

Even if the core material is chosen to minimise hysteresis losses 'iron losses'this contributes to inefficiency, and to the possibility of overheating. DC motors A simple DC motor has a coil of wire that can rotate in a magnetic field.

Electrical motor efficiency is the ratio between shaft output power - and electrical input power. Electrical Motor Efficiency when Shaft Output is measured in Watt. If power output is measured in Watt (W) then efficiency can be expressed as. In physics, there is a standard way to work out how much energy has gone from one thing to another.

It is to calculate the work done in a change. Work is done when an applied force causes something to move in the direction of the force. In thermodynamics, a heat engine is a system that converts heat or thermal energy—and chemical energy—to mechanical energy, which can then be used to do mechanical work.

It does this by bringing a working substance from a higher state temperature to a lower state temperature.

Heat engine

A heat source generates thermal energy that brings the working substance to the high temperature state. Electrical motor efficiency is the ratio between shaft output power - and electrical input power. Electrical Motor Efficiency when Shaft Output is measured in Watt.

If power output is measured in Watt (W) then efficiency can be expressed as.

Homework Help: Calculate the efficiency of the electric motor.

An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and winding currents to generate force in the form of rotation.

Stage 1 Physics – Practical Aim: To calculate the weight limit held and the efficiency of an electric motor.

Heat engine

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.).

Motor efficiency practical physics
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Using an energymeter to measure efficiency of energy transfer