Resistance and Power Questions

• With Ohm's law, no change in resistance means that current and voltage will be:
• One problem with mechanically variable resistors is noticeable in audio circuits as:
• A 2% 55 kΩ resistor would have a color coding of green, green, black, red, red.
• 4 amperes will flow through a 10 Ω resistor if 20 volts are placed across the resistor.
• The resistive track of a rheostat or potentiometer can be classified as having either a linear or tapered resistance.
• Carbon composition resistors are the most common and the least expensive type of fixed-value resistor.
• The maximum potential a material can withstand without rupture is called breakdown voltage.
• A protoboard is used to make experimental circuits.
• A digital voltmeter can be used to measure resistance.
• Variable resistors have problems with the wiper making contact.
• A 12-volt battery is delivering 3 amperes to a resistor. The power dissipated by the resistor is 4 watts.
• Fixed-value resistors can internally short-circuit.
• A load resistance is the resistance of the load.
• Resistance is inversely proportional to current.
• A resistor with a value of 9.9 kΩ 10% could have a value between 8.91 kΩ and 10.89 kΩ.
• An ohmmeter uses an internal battery to measure the resistance of a resistor.
• Resistivity is measured in cmil.Ω/ft.
• One horsepower is 746 watts.
• A rheostat is not a type of variable resistor.
• If 500 mA is flowing through a 10 Ω resistor, the wattage rating of the resistor should be 2 watts.