Current Electricity

Elements have individual currents Currents are additive Voltages are additive Power are additive Preventing a short circuit between conducting wires Preventing an open circuit between the voltage source and the load Conducting very large currents Storing very high currents Zero Negative Positive About 2 ohms per degree Temperature of material is decreased Temperature of material is increased Number of free electrons available becomes more None of the above is correct Magnitude and direction of current remains constant Magnitude and direction of current changes with time Magnitude of current changes with time Magnitude of current remains constant Voltage Current Power Resistance Collisions between conduction electrons and atoms The release of conduction electrons from parent atoms Mutual collisions between metal atoms Mutual collisions between conducting electrons 100 W lamp will glow brighter 40 W lamp will glow brighter Both lamps will glow equally bright 40 W lamp will fuse Decrease Increase Remain constant None of the above ohms/°C mhos/ohm°C ohms/ohm°C mhos/°C Vacuum tubes Carbon resistors High voltage circuits Circuits with low current densities The current through each bulb in same The voltage across each bulb is not same The power dissipation in each bulb is not same None of the above Input power Losses True component of power kWh consumed 4.84 Q 48.4 Q 484 ft 4840 Q 3/2 Q 6 Q 4 Q 8/3 Q Very low Low High Any value 4 : 25 25 : 4 2 : 5 5 : 2 Increases Decreases Remains same None of the above Reduce Increase Decrease Become zero Decreases Increases Remains same None of the above