45 Questions
What is the effect of increasing the resistance in a circuit?
The current decreases
What is the purpose of a rheostat in a circuit?
To adjust the current in a circuit
What type of energy is wasted in a system?
Energy lost to the surroundings
What is the function of a resistor in protecting an LED?
To decrease the current flow through the LED
What is represented by the symbol?
A rheostat
What happens to the brightness of a light bulb when the resistance of a rheostat is decreased?
It becomes brighter
What is the direction of current flow through an LED?
In one direction
What is the primary function of a diode?
To allow current to flow in one direction
What is the main advantage of LEDs over incandescent bulbs?
They are more efficient
According to the Sankey diagram, what percentage of input energy is wasted as heat in an incandescent bulb?
90%
What is the percentage of useful output energy from an LED according to the Sankey diagram?
80%
What is the primary difference between an incandescent bulb and an LED?
The efficiency of energy conversion
What is the purpose of a Sankey diagram?
To compare the efficiency of different lighting systems
Why do LEDs convert a higher percentage of electrical energy into light?
Because they are designed to minimize energy waste
What is the main benefit of replacing incandescent bulbs with LEDs?
They reduce energy waste
What is the main purpose of using a resistor in a circuit with an LED?
To control the current flow and protect the LED
What is the result of increasing the resistance in a circuit with a fixed voltage?
The current decreases
What is the main function of a rheostat in a circuit?
To control the current flow in a circuit
What happens to the energy that is not converted into useful output energy in a system?
It is wasted as heat energy or other forms
What is the primary advantage of using a rheostat in a circuit with a motor?
To control the speed of the motor
What is the main difference between the energy transferred in a system and the energy wasted in a system?
Useful energy and wasted energy
What is the primary function of a resistor in an electrical circuit?
To control the current flow in a circuit
What is the primary role of a diode in a circuit?
To direct current flow
Why are LEDs becoming a popular choice for lighting?
They are more energy-efficient
What do the Sankey diagrams illustrate?
Energy transfer in different systems
What is a key difference between the energy output of incandescent bulbs and LEDs?
LEDs produce less waste energy
What is a benefit of using LEDs in households?
They reduce energy waste
What is the main advantage of using a diode in a circuit?
It directs current flow in one direction
What does the Sankey diagram show about the incandescent bulb?
It produces 10% useful light
What is a characteristic of LEDs in terms of energy conversion?
They convert most energy into light
What is the effect of increasing the resistance in a circuit with a fixed voltage, according to Ohm's Law?
The current decreases
What is the primary function of a rheostat in devices such as sound equipment?
To control the current in a circuit
What is the primary reason why a resistor is used to protect an LED in a circuit?
To prevent the LED from burning out due to high current
What is the primary difference between energy transfers in systems and energy waste in systems?
Energy transfers are useful, while energy waste is not
What is the primary advantage of using a rheostat in a circuit with a motor?
It allows for the control of the motor's speed
What is the primary function of a resistor in an electrical circuit?
To regulate the current in a circuit
What is the primary reason why a diode is used in a circuit?
To control the direction of current flow
What is the primary benefit of using LEDs in households?
They convert a higher percentage of electrical energy into light
What is the main difference between the efficiency of incandescent bulbs and LEDs?
Incandescent bulbs produce more heat, while LEDs produce more light
What is the primary benefit of using a Sankey diagram?
To illustrate the efficiency of an energy system
What is the main characteristic of a diode that makes it useful in electronic devices?
Low resistance to current flow in one direction and high resistance in the other direction
What is the primary advantage of replacing incandescent bulbs with LEDs in households?
LEDs convert a higher percentage of electrical energy into light
What is the purpose of comparing the efficiency of incandescent bulbs and LEDs?
To illustrate the difference in energy conversion between the two
What is the main reason why LEDs are becoming a popular choice for lighting?
They are more efficient and waste less energy as heat
What is the primary difference between the Sankey diagrams for incandescent bulbs and LEDs?
The wasted energy is different
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