Electric Circuits: General Science II
A circuit has total resistance of 5 ohms and a current of 0.3 amperes. The voltage the battery must supply is__________volts.
1.5
You are using an electric motor which requires 40 volts to operate. The motor's circuit uses only 5 amps of direct current. The power is being used is__________watts.
200
The total resistance in this circuit is____________ohms. The battery voltmeter should read__________volts.
30 300
A 24-volt doorbell carries a current of 6 amperes. The resistance in the bell is________ohms.
4
Alternating current cycles back and forth (changes direction)___________times per second in the U.S.
60
volts
PSI
The metric unit of electrical power is the _____.
Watt
semiconductor
a mineral crystal that is used in modern electronics
Westinghouse
alternating current electricity
In the math equation for Ohm's Law, I represent__________and R represents___________ .
amps ohms
The power used by an electrical tool or machine can be determined by multiplying the _____ and _____.
amps volts
Volta
batteries
In order for electric current to flow, an electric circuit must be _____.
closed
When you turn on a television, the electrical circuit _____.
closed
The electrical resistance of a circuit is influenced by the _____, _____, and _____ of the wires.
diameter conductivity length
A circuit carrying current in one direction is called a(n)__________current circuit.
direct
A direct-current generator is called a___________.
dynamo
An electrical wire with low conductivity will have low resistance.
false
Electromotive force is usually provided by a(n) _____ or _____ in an electric circuit.
generator battery
+ voltage
high pressure output
Heating devices can be made by passing an electric current through a conductor of:
high resistance low conductivity
As the total resistance is reduced in a simple electrical circuit, the current flow will _____.
increase
Faraday
induced currents
Edison
light bulb
amps
liters/second
The resistance to water flow in a rough or partially clogged pipe is like a conductor having _____.
low conductivity
- voltage
low pressure intake
If a simple circuit connected to a battery had its wires replaced with thinner (finer) wires, what would the ammeter read?
lower
Oersted
magnetism/electricity
Why has alternating current been preferred for many years?
more efficient transmission less energy loss during transmission
The flow of electricity can be compared to the circulation of water in a(n)_________system.
open
A break in the wires of an electric current will___________the circuit and___________the current. Reconnecting the wires will__________the circuit and_________the current.
open; stop close; start
conductors
pipes
The rate at which energy is used is called__________.
power
Light bulbs use very fine filaments to _____.
produce very high resistance
battery
pump
resistance
restriction
electronic
the study of electrons in motion
ampere
unit for measuring the strength of an electric current
ohm
unit of electrical resistance
volt
unit of electromotive force or electrical potential
switch
valve
open circuit
valve closed
closed circuit
valve open
The standard measure (unit) of electromotive force is
volt
The quantity of electrical current in a circuit depends upon which factors?
voltage ohms
electrons
water
ammeter
water meter
