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The Dinosaur Drawing Delivery

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Additional resources for The Dinosaur Drawing Delivery

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Caution: keep the 10 Ω resistor away from any flammable materials when it is powered by the battery! You may not have enough time to take voltage and current measurements before the resistor begins to smoke. At the first sign of distress, disconnect one of the jumper wires from a battery terminal to interrupt circuit current, and give the resistor a few moments to cool down. With power still disconnected, measure the resistor’s resistance with an ohmmeter and note any substantial deviation from its original value.

You will use the thermometer to measure the temperature of each resistor when powered. With the 330 Ω resistor connected to the battery, measure voltage with a voltmeter. In measuring voltage, there is more than one way to obtain a proper reading. Voltage may be measured directly across the battery, or directly across the resistor. Battery voltage is the same as resistor voltage in this circuit, since those two components share the same set of electrically common points: one side of the resistor is directly connected to one side of the battery, and the other side of the resistor is directly connected to the other side of the battery.

0909 milli-watts (mW), to use a metric prefix. 25 watts, or 250 mW), it is more than capable of sustaining this level of power dissipation. Because the actual power level is almost half the rated power, the resistor should become noticeably warm but it should not over heat. Touch the thermometer end to the middle of the resistor and see how warm it gets. The power rating of any electrical component does not tell us how much power it will dissipate, but simply how much power it may dissipate without sustaining damage.

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