# Physics 101 Part 3

### 53 terms by bsauers

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### In an electrically neutral atom the number of protons in the nucleus is equal to the number of

electrons that surround the nucleus.

positive ion.

close together.

zero.

charge.

a proton.

10 V

### 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

wood

F

opposite signs.

current.

12 A.

more than 20 V

5 ohms

generator

60 watts.

### 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.

series

less

series.

### 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.

96 W

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.

5

### The source of all magnetism is

moving electric charge.

attract.

### An iron nail is more strongly attracted to the

north or south pole - no difference really.

### Magnetic field lines about a current-carrying wire

circle the wire in closed loops

### The force on an electron moving in a magnetic field will be the largest when its direction is

perpendicular to the magnetic field direction.

north pole

north to south

all of these

rod of iron.

motor.

voltage.

the power line

### Transformers use ac so there will be the required

change in magnetic field for operation.

### Compared to the primary voltage, the secondary voltage may be

larger, smaller, or the same.

### The output power of an ideal transformer is

equal to the input power.

5 A.

1:100

55 V.

440 W

300 joules

4 Ω

ohm

### As more bulbs are added in series, the current from the battery ____________ and the current through the bulbs _______________ .

decreases, decreases

the same as

9 A, 3 A

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