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. 4 20 2 40 4 20 2 40 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? 21.4 mA 2 mA 214 mA 2.2 mA 21.4 mA 2 mA 214 mA 2.2 mA 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? 0 V 900 mV 18 V 9 V 0 V 900 mV 18 V 9 V ANSWER DOWNLOAD EXAMIANS APP
Ohm's Law A resistance of 3.3 M is connected across a 500 V source. The resulting current is approximately 15.1 µA 66 mA 660 mA 151 µA 15.1 µA 66 mA 660 mA 151 µA ANSWER DOWNLOAD EXAMIANS APP
Ohm's Law The formula to find I when the values of V and R are known is I = R/V V = IR I = VR I = V/R I = R/V V = IR I = VR I = V/R ANSWER DOWNLOAD EXAMIANS APP
Ohm's Law When 12 V are applied across a 68 resistor, the current is 17.6 mA 816 mA 8.16 mA 176 mA 17.6 mA 816 mA 8.16 mA 176 mA ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS