Electronics Resistance and Materials: Key
Concepts and Calculations Exam
UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS
Who developed the first chemical battery? - CORRECT ANSWER Alessandro Volta
What is the base unit of voltage named after Alessandro Volta? - CORRECT ANSWER Volt
What is the resistance of an electric motor winding using 200 m of copper conductor with a cross-
sectional area of 0.26 cm² at 20°C? - CORRECT ANSWER 0.132 ohms
What is the resistivity of copper at 20°C? - CORRECT ANSWER 0.00000172 ohm-centimeter
What is the primary function of resistors in electronic devices? - CORRECT ANSWER To
control the current
What range of resistance values do resistors come in? - CORRECT ANSWER From less than
10 to many millions of ohms
In most electronic devices, how does the resistance of conductors compare to other parts? -
CORRECT ANSWER It is so small that it can often be ignored.
What is defined as opposition to electric current? - CORRECT ANSWER Resistance
What happens to energy when current flows through resistance? - CORRECT ANSWER It is
converted into heat energy.
What are materials called that have no free electrons? - CORRECT ANSWER Insulators
Concepts and Calculations Exam
UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS
Who developed the first chemical battery? - CORRECT ANSWER Alessandro Volta
What is the base unit of voltage named after Alessandro Volta? - CORRECT ANSWER Volt
What is the resistance of an electric motor winding using 200 m of copper conductor with a cross-
sectional area of 0.26 cm² at 20°C? - CORRECT ANSWER 0.132 ohms
What is the resistivity of copper at 20°C? - CORRECT ANSWER 0.00000172 ohm-centimeter
What is the primary function of resistors in electronic devices? - CORRECT ANSWER To
control the current
What range of resistance values do resistors come in? - CORRECT ANSWER From less than
10 to many millions of ohms
In most electronic devices, how does the resistance of conductors compare to other parts? -
CORRECT ANSWER It is so small that it can often be ignored.
What is defined as opposition to electric current? - CORRECT ANSWER Resistance
What happens to energy when current flows through resistance? - CORRECT ANSWER It is
converted into heat energy.
What are materials called that have no free electrons? - CORRECT ANSWER Insulators
