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. 20 2 40 4 20 2 40 4 ANSWER DOWNLOAD EXAMIANS APP
Ohm's Law What is the approximate resistance of a rheostat if the voltage source is 18 V and the current is 220 mA? 820 82 8.2 8.2 k 820 82 8.2 8.2 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 214 mA 2.2 mA 21.4 mA 2 mA 214 mA 2.2 mA 21.4 mA ANSWER DOWNLOAD EXAMIANS APP
Ohm's Law If you wish to increase the amount of current in a resistor from 120 mA to 160 mA by changing the 24 V source, what should the new voltage setting be? 3.2 V 320 V 32 V 8 V 3.2 V 320 V 32 V 8 V 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 9 V 0 V 18 V 900 mV 9 V 0 V 18 V ANSWER DOWNLOAD EXAMIANS APP
Ohm's Law How much voltage is needed to produce 2.5 A of current through a 200 resistor? 8 V 80 V 50 V 500 V 8 V 80 V 50 V 500 V ANSWER DOWNLOAD EXAMIANS APP
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