A short piece of metal that melts when a large current passes through it is a:
fuse
12 A
current
Heat a copper wire and its electric resistance
increases
the resistance, the current, and the time the circuit operates
decreases
increases
resistance
series
series
An automatic switch that opens when the current reaches a set value is called:
circuit breaker
A circuit has a continuous path through which charge can flow from a voltage source to a device that uses electrical energy. What is the name of this type of circuit?
a closed circuit
Which of the following wires would have the least resistance, assuming that all of the wires have the same cross-sectional area?
a copper wire 5 cm in length
Electrons are made to flow in a wire when there is
Req = R1 + R2 + R3
Which statement is correct?
An ampere is a unit of electrical
current
increases
fuse
The number of current paths in a series circuit is:
one
If a resistor is added to a parallel circuit, the equivalent resistance:
decreases
Which of the following does not affect a material's resistance?
Ohm's law
increases
zero
generator