Circuits Key Definitions/Explanations

What is current?

• Q =I/t

• charge

• the flow of charge

• the rate of flow of charge

In conventional current charge flows from the

• positive terminal to negative terminal

• battery to the components

• negative terminal to the positive terminal

• the supply to the components

What fundamental physics explains Kirchoff's 1st law?

• conservation of energy

• conservation of mass

• conservation of charge

• conservation of time

What fundamental physics explains Kirchoff's 2nd law?

• conservation of energy

• conservation of mass

• conservation of charge

• conservation of time

What should the condition be for Ohm's law?

• temperature must be 0K

• high pressure and temperature

• the temperature must be constant

• the temperature must be high

In teh reverse direction, a diode's resistance is

• very low

• very high

• 0

• infinity

Which of the following components is a semiconductor?

• LDR

• LED

• Resistor

• Switch

Terminal potential difference =

• lost volts

• EMF - lost volts

• lost volts - EMF

• EMF + lost volts

resistivity has units of

• ohms

• ohms per metre

• ohm metres

• ohms per unit area

An NTC thermistor's resistance _________ with decreasing temperature

• decreases

• increases

• changes

• exponentially decreases