future-doctor <3
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A) The 8.0Ω resistance in circuit (C) is a loudspeaker (the battery represents the amplifier). The other resistor is replaced with a variable resistor which can take the values between 0Ω and 30Ω, and is used as a volume control. This volume control changes the voltage across the speaker.
What is the minimum possible voltage across the speaker?

B)A voltmeter with resistance 10kΩ is used to measure the voltage across the 4.0kΩ resistor in circuit (B). What would it read?


C) A thermistor has a resistance of 800Ω at a temperature of 16∘C. It is wired in series with a fixed resistor and a 9.0V battery. A high-resistance voltmeter is connected to give a `temperature' reading.
[Note: that for this thermistor the resistance decreases as the temperature increases]

If the voltmeter needs to read 3.0V when the temperature is 16∘C, what is the resistance of the fixed resistor to 2 significant figures?


Please please help me with these three questions thank you
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Last edited by future-doctor <3; 1 year ago
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username3331778
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the questions are useless without the diagrams they are referencing
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future-doctor <3
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(Original post by Meowstic)
the questions are useless without the diagrams they are referencing
Oh sorry I'll upload now
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future-doctor <3
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(Original post by Meowstic)
the questions are useless without the diagrams they are referencing
I added the diagrams Now
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JoshuaHealey1
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(Original post by future-doctor <3)
A) The 8.0Ω resistance in circuit (C) is a loudspeaker (the battery represents the amplifier). The other resistor is replaced with a variable resistor which can take the values between 0Ω and 30Ω, and is used as a volume control. This volume control changes the voltage across the speaker.
What is the minimum possible voltage across the speaker?

B)A voltmeter with resistance 10kΩ is used to measure the voltage across the 4.0kΩ resistor in circuit (B). What would it read?


C) A thermistor has a resistance of 800Ω at a temperature of 16∘C. It is wired in series with a fixed resistor and a 9.0V battery. A high-resistance voltmeter is connected to give a `temperature' reading.
[Note: that for this thermistor the resistance decreases as the temperature increases]

If the voltmeter needs to read 3.0V when the temperature is 16∘C, what is the resistance of the fixed resistor to 2 significant figures?


Please please help me with these three questions thank you
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Size:  178.5 KB
Hi, I’m a bit late to the convo but did you get an answer to C)? Any help is much appreciated
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