Grade 10 Electronics Review

These flashcards cover key concepts from the Grade 10 Electronics lecture notes, focusing on wire types, resistance, splice techniques, and safety practices.

What is used as a path for electric current in a circuit?

Wire

What is the normal resistance of a conductor?

Low

Which wire allows current to pass normally due to low resistance?

Stranded wire

The smaller the wire, the __ the wire gauge number.

Higher

What type of wire is coated with a thin layer of insulation and used in electromagnets?

Magnet wire

What happens when resistance is too small for the current?

Wire becomes hot.

A wire made of fine woven strands used for shielding or grounding straps.

Braided wire

The bigger the wire size, the __ the gauge number.

Lower

Which type of wire consists of multiple small wires bundled together?

Stranded wire

What defines a solid wire?

Made of one piece of metal.

What is used for cabling installations in buildings, including sockets and lights?

Electrical wire

Which tool is best for measuring the size of a wire?

Wire Gauge

If solid wire has one metal strand, what does stranded wire consist of?

Two or more strands.

Which is a true statement about solid wire?

Made of one strand of metal.

Which wire is commonly used in electronic gadgets?

Ribbon wire.

Which type of stranded wire is used for telephone and cable TV companies?

Communications cable wire.

What type of wire is used for automotive connections?

Automotive wire.

Which tool is best for skinning (stripping) wires?

Wire stripper.

Which wire has a bigger size?

#10 wire

A concentric stranded conductor consists of:

A central wire surrounded by layers of wires.

Which is NOT a use of electrical wire?

Manufacture food.

The biggest wire size is represented as:

#0000 (4/0).

Which characteristic applies to solid wires?

More rugged and stable electrical properties.

A stranded wire that requires a raceway before connecting is:

THN wire.

What type of wire carries more than 6,000 volts?

Transmission wire.

Which wire has a higher resistance: a thinner wire or a thicker wire?

The thinner wire.

If the length of an aluminum wire is doubled, what happens to its resistance?

It is doubled.

What is the effect of a poorly done wire splice?

Overheating and possible fire hazard.

If one copper wire has twice the diameter of another, how do their resistances compare?

The thicker wire has one-fourth the resistance.

Which situation best illustrates the importance of low resistivity conductors?

For transmitting electricity over long distances.

What is the possible result of not stripping insulation properly when splicing wires?

Intermittent or no connection.

Which has higher resistance: an aluminum wire or a copper wire of the same length and diameter?

Aluminum.

What problem arises from overcrowding wires in a junction box?

Overcrowding and overheating.

What is the consequence of making a tap joint opposite to the current flow direction?

Increased chance of wire breakage.

What happens to the resistance if a 90-km aluminum wire's length is reduced to 45 km?

Resistance is halved.

Why is the Western Union splice considered reliable?

Strong mechanical and electrical connection.

Which joint is appropriate for heavy tensile stress?

Duplex cross joint.

A small aerial tap joint is used instead of a plain tap joint. What is the advantage?

Suitable for light conductors

What is a likely problem when using solid aluminum wire instead of stranded copper for long transmission?

Higher resistance and breakage risk.

If a wire's diameter is increased, what happens to its resistance?

Decreases.

What should a technician choose for better efficiency in power transmission?

Copper, because it has lower resistivity and better efficiency.

What is the most important factor for ensuring long-term safety in a splice?

Tightness and conductivity of the joint.

How should one evaluate the use of a Rat-tail joint for a permanent house connection?

Reject it, because it is usually temporary.

What should you conclude if a junction box has twice the recommended number of wires?

It may cause overheating and must be corrected.

How would you assess using bronze wires instead of copper?

Poor, since bronze has higher resistivity than copper.

What is the proper evaluation of wires connected without stripping insulation?

Unsafe and should be corrected.

Do longer wires increase resistance?

Yes, longer wires increase resistance.

A construction foreman uses plain tap joints for high-stress connections. What is your judgment?

Not acceptable; a duplex joint is more suitable.

A wire installation was tested, and resistance values are much higher than expected. What conclusion can be drawn?

There may be poor splicing or undersized wires.

A science project requires efficient electricity transmission. Students choose silver wire, but it is expensive. How should you evaluate this decision?

Excellent choice, since silver has the lowest resistivity but impractical due to cost.

Why is it important to strip the wire before splicing?

To ensure electrical contact between conductors.

Which best describes a splice joint?

Joining two wires end to end permanently.

What splice is most suitable for joining two small solid wires inside a building?

Western Union Short Tie.

What happens if wires are not tightly spliced together?

Voltage loss and overheating may occur.

What type of splice is best for temporary connections in construction sites?

Small Aerial Tap Joint

The Plain Tap Joint is commonly used when the tap wire is under ___.

Considerable tensile stress

Why are Western Union Long Tie joints preferred for outdoor installations?

They provide stronger mechanical bond.

What is the difference between Western Union Short Tie and Long Tie joints?

Number of twists made.

When two wires are joined in opposite directions, which joint is most appropriate?

Double Wrapped Cross Joint

What type of joint should be used when the tap wire is difficult to wrap around a large solid conductor?

Wrapped Tap Joint.

Why must wires be joined tightly when creating a splice?

To reduce electrical resistance.

A student spliced two wires but did not insulate them properly. What could be the result?

Short circuit and safety hazard.

What does the Knotted or Loop Tap Joint help prevent?

Separation due to tension.

Which splice is used in conduit systems with duplex wires?

Duplex Wire Splice.

What type of joint connects fixture leads to branched wires?

Through Fixture Joint.

What demonstrates poor splicing practice?

Leaving exposed wires uninsulated after splicing.

Evaluate the effectiveness of using a Rat Tail Joint in heavy load applications.

Suitable only for light connections.

A technician spliced three wires together for a lighting circuit. Which splice is most appropriate?

Rat Tail Joint

When evaluating the strength of joints, which factor contributes most to reliability?

Tightness and soldering quality.

Why should the spliced wire be insulated after joining?

To protect from corrosion and short circuit.

What practice best demonstrates safety and efficiency in splicing?

Stripping wires before connecting and insulating them.

Evaluate Wrapped Tap Joint compared to Plain Tap Joint.

Wrapped Tap is stronger for large conductors.

A technician chose to use Scarfed Splice for joining thick conductors without connectors. What does this indicate?

Appropriate use for large wires.

What is the best joint for connecting a fixture at the end of a circuit?

Terminating Fixture Joint

How does knowing different types of wire splices help as a future technician?

It improves understanding of electricity flow and safety.