Motorized Power How can I measure resistance of an electronic device?
Let's say I have a motorized toy. How do I go about measuring the electrical resistance of the toy? (I have a multimeter) The whole plan is to test various batteries, so using Ohm's law I can calculate the power output of batteries knowing the voltage and resistance
OK, so how can I measure the power output of AA batteries in general?
Also, how can I measure the current of the toy with only access to the battery terminals?
The resistance characterizes something, which obeys
Ohm's law, for example a coil of wire, or a resistor.
Ohm's law states that in such simple case voltage is
proportional to current, and coefficient is called
"resistance": U = IR
Electronic devices never obey Ohm's law.
Firstly, their current consumption is not proportional
to voltage. Secondly, you can alter current consumption
_without altering voltage. For example if you increase
the volume of your walkman, the current consumption
will increase, while voltage will actually slightly decrease.
For all the above reasons you cannot measure "resistance"
of your toy, because it does not have "resistance".
However, you can measure power consumption P = UI.
The most straightforvard way is to measure both
resistance and current _simultaneously.
In order to do this you need two multimeters.
One should be set into voltage measuring mode, and
its terminals must be connected to the terminals of
battery in parallel.
The current part is more tricky. I suggest that you take
two strips of aluminum foil, and sandwich insulating
piece of scotch between them. The sandwich will
resemble capacitor. Attach the wires of the second
multimeter (set it to current mode) to the strips of foil,
and shove the 'sandwich' in the slit between the terminal
of the battery and the terminal of the toy, so that current
will flow through the second multimeter.
Now you are all set. Turn your car uside down, and let
its weels idle in the air. Measure the voltage U and
current I, and calculate the power. Then apply some
friction to the weels, to load and slow down them.
Make the measurements gradually increasing friction
until the weels can no longer rotate. Plot voltage U,
current I and power P=UI as a function of friction,
or speed of rotation. If not for fun, it will make a
nice science fair presentation.
CD-RRWMP3WMA playbackSingle DINPeak power output 60 watts x 4 channelsRMS power output 18 watts x 4 channelsiPodiPhone device compatibilityCharges most USB devices2-step motorized faceplateIf the item is listed, this means there are 5 or more units i
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This motorized LEGO excavator really moves! Massive remote-control building action! Build all sorts of construction vehicles! Spin the cabin, maneuver the arm, and dig with the shovel. This motorized LEGO excavator really moves! So, build it and dig in! No dirty job is too big for the heavy-duty, 18-inch long LEGO Technic 8043 Motorized Excavator. Just flip a switch on the LEGO Power Functions dual-infrared remote control to drive the excavator to job sites, spin the cabin 360 degrees, maneuver the articulated arm, and dig with the shovel. 1,123 awesome pieces enable you to build all sorts of construction vehicles, for massive remote-control action!
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How do I remove old linoleum from a concrete slab?
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- Someone mentioned a heat gun?
We removed ours with boiling water and a metal shovel, it worked the best, but was still hard work.
