Chapter 6 & 7 Flashcards
An automobile headlight draws a current of 6 amperes, operating on 12 volts . The resistance of the headlight in ohms is
2
Suppose current is flowing in a wire from right to left. Which way do the electrons in the wire move?
left to right.
A heater is rated at 1200 watts for a 120 volt source. The current in amperes drawn by the heater is
10
If a compact fluorescent lightbulb (CFL) breaks, the Environmental Protection Agency (EPA) recommends that hazardous material (HazMet) cleanup procedures be followed. This is because it contains which hazardous material
mercury
What is the speed of sound in the air in meters/second inside a furnace where the temperature is 500 degrees Celsius (773 Kelvin)?
558.8
You pull on a rope with a certain force, and a wave travels in the rope with a certain velocity. If you exert four times as much force, the velocity of a wave in the rope is now _____ the original velocity.
2 times
Why do we use fuses and circuit breakers?
to prevent fires.
A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts. The power consumed by the light bulb in watts is
720
Water ripples are produced by making a cork oscillate up and down at a frequency of 5 Hz. The peaks of the ripples are 0.03 meters apart. What is the speed in meters/second of the water ripples?
0.15
The term “ultrasound” is applied to waves which have a much greater _____ than sound waves.
frequency
What is the usual symbol used to represent an amount of charge?
q
You shout at a cliff, and hear your echo in 2 seconds. If the speed of sound in the air is 340 m/s, the distance of the cliff from you in meters is
340
The energy in Joules used by a 100 watt light bulb in 1 hour is
360000
Which of the following is not an example of real time ultrasound?
B-Mode Scanner
the SI unit of electric charge
Coulomb
an atom with fewer electrons than protons
positive ion
type of current supplied by a battery
DC current
employed in appliances like toasters and hair dryers
ohmic heating
the SI unit of current
Ampere (Amp)
consists of charges flowing back and forth
AC current