In an electrically neutral atom the number of protons in the nucleus is equal to the number of
electrons that surround the nucleus.
Electric potential, measured in volts, is the ratio of electric energy to amount of electric
When the distance between two charges is halved, the electrical force between the charges
The direction of an electric field is the direction of the force that the field would exert on
If you use 10 J of work to push a coulomb of charge into an electric field, its voltage with respect to its starting position is
An electroscope is charged positively as shown by foil leaves that stand apart. As a negative charge is brought close to the electroscope, the leaves
fall closer together
Two charged particles attract each other with a force F. If the charges of both particles are doubled, and the distance between them also doubled, then the force of attraction will be
Two charged particles held close to each other are released. As they move, the force on each particle increases. Therefore, the particles must have
When a 10-V battery is connected to a resistor, the current in the resistor is 2 A. What is the resistor's value?
When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is
less than the resistance of either lamp.
On some early automobiles both headlights went out when one bulb burned out. The headlights must have been connected in
A 100-Watt lamp glows brighter than a 25-Watt lamp. The electrical resistance of the 100-Watt lamp must be
Two lamps, one with a thick filament and one with a thin filament, are connected in series. The current is greater in the lamp with the
the same in each lamp
Two lamps, one with a thick filament and one with a thin filament, are connected in parallel to a battery. The voltage is greatest across the lamp with the
Both voltages are the same.
If 0.8 A of current flow through a light bulb connected to a 120 V outlet, the power consumed is
A 60-W light bulb and a 100-W light bulb are each rated at 120 V. Which light bulb has a larger resistance?
the 60-W bulb
A 60-W light bulb and a 100-W light bulb are connected in series to a 120 V outlet. Which light bulb has more current in it?
Both have the same current.
An electric heater is rated at 300 W when used in a 110-V circuit. The safety fuse in the circuit can handle 15 A of current. How many heaters can be safely operated in the circuit?
The force on an electron moving in a magnetic field will be the largest when its direction is
perpendicular to the magnetic field direction.
The magnetic field strength inside a current-carrying coil will be greater if the coil encloses a
rod of iron.
A certain transformer doubles input voltage. If the primary coil has 10 A of current, then the current in the secondary coil is
Neon signs require about 12,000 volts to operate. If the circuit uses a 120-volt power source, the ratio of primary to secondary turns on the transformer should be
The voltage across the input terminals of a transformer is 110 V. The primary has 50 loops and the secondary has 25 loops. The voltage the transformer puts out
Four amperes of current exist in the primary coil of a transformer. The voltage across the primary coil is 110 V. What is the power output of the secondary coil?
Five 20 Ω resistors are connected in parallel. The equivalent (total) resistance of this circuit is ______________ .
As more bulbs are added in series, the current from the battery ____________ and the current through the bulbs _______________ .
Resistor A has a larger resistance than resistor B. When they are placed in parallel, the voltage drop across A is ____________ the voltage drop across B.
the same as