Loudspeakers & Microphones — GCSE Physics Revision
Revise Loudspeakers & Microphones for GCSE Physics. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Electromagnetic InductionWhat is Loudspeakers & Microphones?
Loudspeakers and microphones are devices that convert between sound waves and electrical signals. A loudspeaker uses the motor effect to turn an electrical signal into sound. A varying current in a coil attached to a cone causes it to vibrate, creating sound waves. A microphone does the opposite, using the generator effect. Sound waves make a diaphragm and a coil vibrate in a magnetic field, which induces a current that matches the sound.
Board notes: Covered by AQA and Edexcel. OCR covers the principles but may not focus on these specific devices in as much detail. The link to the motor and generator effects is key.
Step-by-step explanationWorked example
Explain how a loudspeaker creates a sound wave. Solution: An alternating electrical signal is passed through a coil of wire attached to a cone. The coil is in a magnetic field, so it experiences a force due to the motor effect. As the current changes direction, the force changes direction, causing the coil and the cone to vibrate. These vibrations push and pull on the air, creating sound waves.
Mini lesson for Loudspeakers & Microphones
1. Understand the core idea
Loudspeakers and microphones are devices that convert between sound waves and electrical signals. A loudspeaker uses the motor effect to turn an electrical signal into sound.
Can you explain Loudspeakers & Microphones without copying the notes?
2. Turn it into marks
Explain how a loudspeaker creates a sound wave. Solution: An alternating electrical signal is passed through a coil of wire attached to a cone.
Underline the method, evidence, or command-word move that would earn credit in GCSE Magnetism & Electromagnetism.
3. Fix the likely mark leak
Watch for this mistake: Confusing which device uses which effect. Loudspeaker = Motor Effect (electrical to sound). Microphone = Generator Effect (sound to electrical).
Write one correction rule before doing another practice question.
Practise this topic
Jump into adaptive, exam-style questions for Loudspeakers & Microphones. Free to start; sign in to save progress.
Loudspeakers & Microphones practice questions
These are original StudyVector questions for revision practice. They are not official exam-board questions.
Question 1
In one GCSE sentence, explain what Loudspeakers & Microphones is testing.
Answer: Loudspeakers and microphones are devices that convert between sound waves and electrical signals. A loudspeaker uses the motor effect to turn an electrical signal into sound.
Mark focus: Precise definition and topic focus.
Question 2
A Loudspeakers & Microphones question uses an unfamiliar context. What should the answer do before adding detail?
Answer: It should name the process, variable, equation, particle model, or evidence being tested, then explain the result using precise scientific vocabulary.
Mark focus: Method selection and command-word control.
Question 3
A student makes this mistake: "Confusing which device uses which effect. Loudspeaker = Motor Effect (electrical to sound). Microphone = Generator Effect (sound to electrical)." What should their next repair task be?
Answer: Do one Loudspeakers & Microphones question and review the mistake type.
Mark focus: Error correction and next-step practice.
Loudspeakers & Microphones flashcards
Core idea
What is the main idea in Loudspeakers & Microphones?
Loudspeakers and microphones are devices that convert between sound waves and electrical signals. A loudspeaker uses the motor effect to turn an electrical signal into sound.
Common mistake
What mistake should you avoid in Loudspeakers & Microphones?
Confusing which device uses which effect. Loudspeaker = Motor Effect (electrical to sound).
Practice
What is one useful practice task for Loudspeakers & Microphones?
Answer one Loudspeakers & Microphones question and review the mistake type.
Exam board
How should you use board notes for Loudspeakers & Microphones?
Covered by AQA and Edexcel. OCR covers the principles but may not focus on these specific devices in as much detail.
Common mistakes
- 1Confusing which device uses which effect. Loudspeaker = Motor Effect (electrical to sound). Microphone = Generator Effect (sound to electrical).
- 2Not being able to explain how the vibrations are created or detected. It is all about the interaction between the coil, the magnet, and the cone/diaphragm.
- 3Thinking that the current in a loudspeaker is constant. It must be a varying alternating current that matches the frequency of the desired sound.
Loudspeakers & Microphones exam questions
Exam-style questions for Loudspeakers & Microphones with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Loudspeakers & Microphones
Core concept
Loudspeakers and microphones are devices that convert between sound waves and electrical signals. A loudspeaker uses the motor effect to turn an electrical signal into sound. A varying current in a co…
Frequently asked questions
How does a microphone work?
In a dynamic microphone, sound waves cause a diaphragm to vibrate. A coil attached to the diaphragm also vibrates within a magnetic field. This movement of the coil in the field induces an electrical current that mirrors the original sound wave.
What is the difference between a loudspeaker and a microphone?
A loudspeaker converts electrical energy into sound energy. A microphone converts sound energy into electrical energy. They are essentially the reverse of each other.