Chapter Questions
Name the particles that revolve in orbital patterns around the nucleus of an atom.__________________________
Will a proton attract or repel an electron? __________________________
A current that changes direction and intensity at a regular interval of time is called:__________________________
Explain the meaning of voltage, current, and resistance. __________________________
State Ohm's law, and write three forms of Ohm's law using equations.__________________________
What instruments are used to measure voltage, current, and resistance?__________________________
What units of measure are used for voltage, current, and resistance? __________________________
A trouble light has a resistance of $12 \mathrm{ohms}$ and is rated at $1 / 2$ ampere. What voltage must be applied to obtain the rated current? __________________________
What current is taken by a heater with a resistance of $24 \mathrm{ohms}$ when connected to a 120 -volt supply? __________________________
Determine the resistance of a lamp that draws 3 amperes when connected to a 120 -volt supply. __________________________
If the lamp in problem 10 is connected to a 240 -volt supply, what is the new value of current? (Assume there is no change in resistance as the temperature of the lamp changes.) __________________________
An 8-ohm resistor is connected to a 120 -volt circuit. What current will it draw?__________________________
If 60 volts are applied to an 8-ohm resistor, what is the value of current through the resistor? __________________________
A toaster is connected to a 120 -volt supply and it draws 8 amperes. Find the resistance. __________________________
A 5-ohm heater draws 9 amperes from a power supply. What is the voltage of the power supply? __________________________
If the 5-ohm heater in problem 15 is replaced with a 15 -ohm heater, what current will the 15 -ohm heater draw from the same power supply? __________________________
What voltage must be applied to a 6.4-ohm lamp filament to develop 20 amperes of current? __________________________
An ammeter placed in a lighting circuit registers a current of 3 amperes. If a 24-volt source has been applied, what is the circuit resistance? __________________________
If an ohmmeter measures the resistance of a load as $7 \mathrm{ohms}$, and a source of 28 volts is applied, what is the current? __________________________
If the resistance in a circuit remains constant, what will happen to the current if the voltage increases? __________________________
If the voltage of a circuit remains constant, what will happen to the current if the resistance increases? __________________________
What is the term given to anything that has weight and occupies space? __________________________