Placement Training - Technical (Electronics)

An electric heater draws 3.5 A from a 110 V source. The resistance of the heating element is approximately

• 385 ohms

• 38.5 ohms

• 3.1 ohms

• 31 ohms

The formula to find I when the values of V and R are known is

• I = VR

• I = VR

• V = IR

• I = V/R

A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange, orange, silver?

• 2 mA

• 2.2 mA

• 214 mA

• 21.4 mA

A series circuit consists of three resistors with values of 120 , 270 , and 330 . The total resistance is

• less than 120

• the average of the values

• 720

• 120

In order to get maximum power transfer from a capacitive source, the load must

• have a capacitive reactance equal to circuit resistance

• have an impedance that is the complex conjugate of the source impedance

• be as capacitive as it is inductive

• none of the above

Materials with lots of free electrons are called

• conductors

• insulators

• semiconductors

• filters

The unit of electrical charge is the

• coulomb

• joule

• volt

• watt

Current flows in a circuit when

• a switch is opened

• a switch is closed

• the switch is either open or closed

• there is no voltage

Which of the following is not a type of energy source?

• generator

• rheostat

• solar cell

• battery

Electrons in the outer orbit are called

• nuclei

• valences

• waves

• shells