Basic Electricity and Electronics Quiz

Explain why a calculator is considered an open-loop system and not a closed-loop system.

• Because it has a display screen

• Because it does not respond to changes or feedback

• Because it uses a microchip

• Because it requires electricity

What is the main function of feedback in a typical electronic system?

• To provide power to the system

• To respond to changes in the environment

• To store information

• To increase the speed of processing

Why is the combined resistance in a parallel circuit less than the individual resistances?

• Because the current only flows through one resistor.

• Because the voltage is divided among the resistors.

• Because there are multiple paths for the current to flow.

• Because the resistors are not connected to a battery.

What is the definition of power in an electrical device?

• The amount of resistance in a circuit

• The rate at which energy is changed

• The total voltage supplied to a circuit

• The number of electrons flowing per second

After finding the total resistance (R_tot) in the parallel circuit, how do you calculate the total current (I_tot) supplied by the battery?

• I_tot = V_tot × R_tot

• I_tot = V_tot / R_tot

• I_tot = R_tot / V_tot

• I_tot = V_tot + R_tot

What is the main function of a switch in a circuit?

• To increase the voltage in the circuit.

• To control the circuit by turning it on or off.

• To decrease the resistance in the circuit.

• To store electrical energy.

A student wants to control a fan using a simple on/off switch that requires pushing to operate. Which switch should they use?

• Slide Switch

• Push-Button Switch

• Toggle Switch

• Rotary Switch

What is the main function of a switch in a circuit?

• To increase the voltage in the circuit

• To control the circuit by turning it on or off

• To decrease the current in the circuit

• To store electrical energy

A student wants to design a security system that detects when a door is opened or closed. Which switch would be most suitable for this application and why?

• Tilt Switch, because it detects changes in temperature

• Reed Switch, because it operates with a magnet and can detect door movement

• Toggle Switch, because it can be manually turned on or off

• Push Button, because it is easy to press

What will happen to the bulb if one of the SPST switches in series is open?

• The bulb will not light up

• The bulb will glow brighter

• The bulb will flicker

• The bulb will explode