are materials possessing an electrical conductivity significantly lower than most metals yet much higher than standard insulators______________?
Show answer Hide answer
Answer: C. Semi-conductors
Explanation
Semiconductors are specialized materials whose electrical conductivity falls strictly between metals and insulators. Their crystalline atomic structure prevents free electron movement like metals while allowing controlled conduction. Introducing specific chemical impurities dramatically alters this intermediate conductivity to build useful electronic devices. Silicon and germanium are the most common elemental semiconductor materials used in modern microelectronics. Energy band theory shows that semiconductors possess a narrow forbidden bandgap that electrons can cross. Conductivity in semiconductors increases with temperature because thermal energy frees more charge carriers.
Semiconductor physics forms the absolute foundation for manufacturing computer processors, memory chips, and diodes. Modern telecommunications rely heavily on semiconductor lasers and optical detectors for high-speed fiber data networks. Power conversion systems use semiconductor switches to improve efficiency in electric vehicles and solar inverter units. Varistors are non-linear voltage-dependent resistors designed to protect circuits from high-voltage transient surges. Thermistor components are temperature-sensitive resistors used primarily for accurate thermal sensing and compensation. Variable resistors are manual adjustment components designed to alter resistance in working electronic circuits.
- Subject
- Engineering
- Category
- Electrical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. Which of the following is not equivalent to a watt_____________?
Show answer Hide answer
Answer: D. amperes/volt
Power in watts represents the rate of energy transfer and is fundamentally defined as amperes divided by volts. Amperes divided by volts calculates electrical conductance in Siemens, which measures the ease of current fl...
Q2. What device is utilized for detecting electric current_____________?
Show answer Hide answer
Answer: D. galvanometer
A galvanometer is a sensitive electromagnetic instrument designed to detect small electric currents. It operates by deflecting a pointer when current flows through its internal wire coil. This sensitivity makes it ideal...
Q3. What reading does an ohmmeter give when testing an open resistor_____________?
Show answer Hide answer
Answer: B. infinite
An open resistor has a completely broken internal conductive path that stops current flow entirely. According to Ohm's law, zero current flow across a voltage gap corresponds to an infinitely high resistance. An ohmmeter...
Q4. Assuming 8 bits for data, 1 bit for parity, I start bit and 2 stop bits, the number of characters that 1200 BPS communication line can transmit is__________________?
Show answer Hide answer
Answer: C. 12CPS
Each data transmission character frame requires one start bit, eight data bits, one parity bit, and two stop bits. Summing these framing components results in a total requirement of twelve bits for every transmitted char...
Q5. A 16-ampere current splits between two parallel branches of 8 ohms and 12 ohms resistance. The current in each branch equals_____________?
Show answer Hide answer
Answer: B. 6.4 A, 9.6 A
Current splits inversely proportional to branch resistances in a parallel electrical circuit. Using the current divider rule yields branch currents of six point four amperes. The complementary branch current evaluates co...
Q6. What is the resistance value of a closed switch_____________?
Show answer Hide answer
Answer: A. zero
An ideal closed switch provides an uninterrupted metallic pathway for electric current to travel through. Because the conductive contacts press tightly together, the voltage drop across the switch is practically zero. Ap...