Motorized Battery Power

How I can measure the resistance of an electronic device?

Say I have a toy motor. How do I measure the resistance electric toys? (I have a multimeter) The whole plan is to test multiple batteries, so using Ohm's law I can calculate the Battery Power know the voltage and good resistance, so how I can measure the power output of AA batteries in general? Also, how I can measure the current toy with access only to the battery terminals?

Resistance characterizes something that obeys Ohm's law, for example, a coil of wire or a resistor. Ohm's law states that tension, simple case is proportional to the current, and the coefficient is called "resistance": U = IR electronic devices not obey Ohm's law. First, current consumption is not proportional to strain. Secondly, consumption can change _without altering blood flow. For example, if you increase the volume of the walkman, the current consumption will increase while the voltage is actually reduced slightly. For the above reasons that can not be measured "resistance" to his toy, because it has no "resistance." However, you can measure the power consumption P = UI. Most straightforvard way is to measure resistance and current _simultaneously. To do this you need two multimeters. You have to watch mode voltage, and terminals should be connected to the battery terminals in parallel. The current part is more difficult. I suggest you take two strips of aluminum foil and insulating sandwich piece of whiskey between them. The sandwich will seem capacitor. Wire the meter second (to put it in current mode) to strips of aluminum foil and put the sandwich in the groove between the battery terminal and the terminal of the toy, so the current will flow through the second meter. Now you're all set. Turn your USID car, and let your weels inactive in the air. Measure the voltage U and current I, and calculate power. Then apply a little friction in the weels to and stop charging them. Make the measurements increased gradually until the friction weels can not rotate. Plot of voltage U, current I and power P = UI in terms of friction, or the speed of rotation. If not for fun, will make a presentation of the science fair atmosphere.