Physics quiz 3/29
Cards (12)
- A voltmeter measures voltage
- An ammeter measures current
- Voltmeters are connected in parallel with whatever device's voltage is being measured
- Ammeters are connected in SERIES with the device
- The heart of most analog meters in a galvanometer. Current flow through a galvanometer IG produces a proportion needle deflection
- 2 crucial characteristics of a galvanometer
- resistance
- current sensitivity
- Null measurements - balance voltages so that there is no current flowing through the device
- Potentiometer - null measurement device for measuring voltages
- Wheatstone bridge - null measurement device used for calculating resistance by balancing potential drops in a circuit
- RC circuit - one that contains a resistor and a capacitor
- Materials that exhibit strong magnetic effects are calledferromagnetic
- Electromagnetism is the use of electric current to makemagnets