Ohm's Law A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms. 2 4 40 20 2 4 40 20 ANSWER DOWNLOAD EXAMIANS APP
Ohm's Law You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed? 900 mV 18 V 9 V 0 V 900 mV 18 V 9 V 0 V ANSWER DOWNLOAD EXAMIANS APP
Ohm's Law A current of 200 µA through a 6.8 k resistor produces a voltage drop of 340 V 1.36 V 34.4 V 13.6 V 340 V 1.36 V 34.4 V 13.6 V ANSWER DOWNLOAD EXAMIANS APP
Ohm's Law How much resistance is required to limit the current from a 12 V battery to 3.6 mA? 2.2 k 33 k 22 k 3.3 k 2.2 k 33 k 22 k 3.3 k ANSWER DOWNLOAD EXAMIANS APP
Ohm's Law A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange, orange, silver? 2 mA 21.4 mA 214 mA 2.2 mA 2 mA 21.4 mA 214 mA 2.2 mA ANSWER DOWNLOAD EXAMIANS APP
Ohm's Law Approximately how many milliamperes of current flow through a circuit with a 40 V source and 6.8 k of resistance? 5.9 mA 59 mA 27.2 mA 590 mA 5.9 mA 59 mA 27.2 mA 590 mA ANSWER DOWNLOAD EXAMIANS APP
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