Neither 3 ohms nor 8 ohms is more powerful; the ohm is not a unit of power but of resistance to electrical current. However, an 8-ohm resistor has a greater ability to resist or reduce power.
Continue ReadingResistance to electrical current is often attained in electrical circuits with the use of a resistor. A resistor's ability to resist current is measured in ohms. Given a particular voltage, a higher amount of ohms means that there is a lower current flowing through the resistor. A decrease in current flow at a given voltage means a decrease in power. Therefore, a resistor with a higher ohm rating typically indicates a lower power output.
Learn more about MeasurementsWatts are a unit of power, whereas a BTU is a measurement of energy. A single BTU per hour corresponds to approximately 0.293 watts of power.
Full Answer >A megaohm is equivalent to 1,000,000 ohms. In physics, an ohm is the measure of electrical resistance of a circuit. Ohms are related to voltage V and the electric current I with the equation known as Ohm's law.
Full Answer >To measure resistance on a multimeter, switch the device to ohms or resistance, and find the scale that measures resistance. Attach the test leads to the corresponding jacks, hold the ends of the test leads together, and set the zero adjust knob to zero. Find the electrical contact points of the appliance the resistance of which you want to measure, press the two probes of the multimeter to them, and observe the value indicated on the scale.
Full Answer >Ohm's law is mainly used when building electrical devices to determine the amount of resistance needed to establish a certain current with a certain amount of voltage. Without Ohm's law, the circuit may have too much or too little current or voltage.
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