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April 19, 2015

Homework Help: science(check answers)

Posted by matt on Monday, March 31, 2014 at 1:11pm.

1.D
2.A
3.A
4.im not sure please help
5.false




One light bulb in a string of lights goes out. This causes all of the other lights in the string to also go out. This is an example of a

A. resistor.
B. parallel circuit.
C. closed circuit.
D. series circuit.


2.When a switch is turned from the off to the on position, it is changing the circuit in which of the following ways?

A. An open circuit is being changed into a closed circuit.
B. A closed circuit is being changed into an open circuit.
C. A parallel circuit is being changed into a series circuit.
D. A series circuit is being changed into a parallel circuit.


3.Early telephone poles had wires that connected inside bell-shaped glass enclosures like the ones shown below.

several bell-shaped glass enclosures

These glass enclosures helped to keep the electric current from moving outside the circuit of wires. The glass enclosures were used as

A. insulators.
B. conductors.
C. resistors.
D. switches.


4.Use Ohmís Law to determine the resistance in a circuit if the voltage is 12.0 volts and the current is 4.0 amps.

A. 8.0 ohms
B. 48 ohms
C. 3.0 ohms
D. 12 ohms


5.In a closed circuit, the current only flows from the power source to an electrical device such as a lamp

A.TRUE
B.FALSE

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