Phy 2A- CIRCUITS
- Created by: Shine.7
- Created on: 20-02-15 12:59
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- Phy 2A- CIRCUITS
- Current (A)- flow of electric charge
- AMMETER( NEVER placed parallel)
- Potential difference/Voltage (V)- driving force that pushes the current
- V=W/Q
- VOLTMETER (MUST be placed parallel-around component)
- V=LxR
- steeper the graph-lower resistance
- curve= resistance is changing
- straight-line graph-resistance is steady
- steeper the graph-lower resistance
- Resistance (Ohms)- slows down the flow
- as you vary the resistor,this alters the current flowing
- Charge (C)- bigger current flows= more charge passes
- L=Q/T
- Resistence increases with temp
- when electrical energy is transferred to heat e. -resistor gets hot -heat makes ions vibrate more -making it difficult for electrons to get through -current cant flow easily so resistance increases with temp!
- DIODE- current flows in 1D
- LED: emits light when current flows in
- LDR: depends on light intensity
- THERMISTOR: temp dependant
- Current (A)- flow of electric charge
- V=voltage/p.d Q= charge(C) L= current(A) R=resistance (ohms) T=time (s) W=work done(J)
- P.D Current Resistance
- Same everywhere
- Shared
- Adds up
- same across all components
- is shared
- depends on current ( low rs=high cur)
- SERIES
- PARALLEL
- RESISTORS
- DEVICES
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