Simple Machines
This simple machine consists of a bar that pivots on a fulcrum.
What is a lever?
High-voltage electricity travels long distances using these.
What are power lines?
This unit is used to measure electrical power.
What is a Watt?
This process occurs when a conductor moves through a magnetic field and generates current.
What is electromagnetic induction?
This component of a circuit controls whether electricity flows.
What is a switch?
A wheelbarrow is an example of this type of lever.
What is a second-class lever?
Before entering homes, electricity must pass through this device to reduce voltage.
What is a transformer?
Explain why a circuit with only one path for current is called a series circuit.
What is "because current must pass through each component one after another"?
Explain why electric motors and generators are based on similar principles.
What is "both convert energy between electrical and mechanical forms using magnets and coils"?
Compare the function of a fuse and a circuit breaker.
What is "both stop excessive current, but a fuse must be replaced while a breaker can be reset"?
A pulley system with both a fixed and moveable pulley is called this.
What is a block and tackle?
Explain why power stations use AC instead of DC for transmission.
What is "AC can be transformed to different voltages easily, reducing energy loss"?
Who made the first battery, and how did it work?
What is "the first battery was made by Alessandro Volta, called "the Voltaic Pile", which used alternating layers of zinc and copper discs separated by saltwater-soaked cloth to generate an electric current"?
Predict what happens to an electromagnet’s strength when the number of coils increases.
What is "the strength increases due to a stronger magnetic field"?
If a toaster and microwave cause a circuit breaker to trip, what should you do?
What is "use separate outlets or reduce power usage"?
In a pulley, this equation is determined by the number of rope segments supporting the object.
What is Ideal Mechanical Advantage?
What is the function of a circuit breaker in home electrical systems?
What is "to prevent electrical fires by stopping excessive current"?
If one bulb in a string of holiday lights goes out and they all turn off, what type of circuit is it?
What is a series circuit?
What device is used to change voltage levels in power distribution?
What is a transformer?
In what direction do electrons move in a battery?
What is "from negative to positive"?
How does friction affect the efficiency of a simple machine, and what are ways to reduce it?
What is "friction reduces efficiency by converting energy to heat; smoother surfaces reduce friction"?
How do step-up and step-down transformers help efficiently deliver electricity to homes and businesses?
What is "step-up transformers increase voltage for long-distance transmission to reduce energy loss, while step-down transformers lower voltage for safe use in homes and businesses"?
How can you calculate electrical power using voltage and current, and why is this equation useful in real-world applications?
What is "Power is equal to voltage times current (P = V × I), which helps in determining energy consumption and designing electrical systems efficiently"?
How are electromagnets used in power plants to generate electricity?
What is "electromagnets in generators convert mechanical energy into electrical energy by rotating within a magnetic field"?
Why are parallel circuits preferred over series circuits in household wiring?
What is "parallel circuits ensure devices operate independently, preventing complete power loss if one device fails"?