SKTU 1612 Electrical Technology Fundamentals - Quiz 1 (CLO1)

Instruction: Circle or underline your answer. Why is electricity considered a tertiary energy form?

• It is the raw form of energy from nature

• It is converted directly from sunlight

• It is derived from primary energy sources after several processes

• It can only be generated from coal

Which of the following is NOT a common use of electricity?

• Industrial machinery

• Transportation systems

• Street lighting

• Domestic appliances

In the analogy of electricity with water flow, what does the friction in the pipe represent?

• Voltage

• Current

• Resistance

• Power

• 0.50 mA

• 1.50 mA

• 2.00 mA

• 2.50 mA

• 0.15 W

• 2.25 W

• 2.25 mW

• 0.002 W

A 100 W bulb is replaced with a 10 W LED light, used 7 hours per day for 30 days. What is the approximate monthly energy saving?

• 19 kWh

• 21 kWh

• 25 kWh

• 30 kWh

An electric car battery has a capacity of 90 kWh. How long will it take to charge from 10% to 80% using an 80-kW charger (assume linear charging)?

• 30 m

• 48 m

• 1.8 h

• 2.5 h

Conductance is defined as:

• The ability of a material to resist current flow

• The ability of a material to conduct electric current

• The product of resistance and current

• The rate of voltage change

If the resistance of a conductor increases with temperature, the material is likely a:

• Semiconductor

• Superconductor

• Metal

• Insulator

A resistor rated at 0.25 W is connected to a 6 V battery. Which of the following current values will destroy the resistor?

• 38 mA

• 40 mA

• 42 mA

• 43 mA