Resistance (Junior Cert Wood Technology): Flashcards
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Practise the cards
13 cards from this deck
Function of resistance
Function of resistance
Stops current flow, controls energy, converts to heat
Definition of resistor
Definition of resistor
Adds resistance to control current & voltage
Unit of resistance measurement
Unit of resistance measurement
Ohms (Ω)
Tool for measuring resistance
Tool for measuring resistance
Multimeter
Safety before measuring resistance
Safety before measuring resistance
Switch off power
Materials: low vs high resistance examples
Materials: low vs high resistance examples
Copper = low resistance, rubber = high resistance
Temperature effect on conductor resistance
Temperature effect on conductor resistance
Heat increases resistance
Effect of larger cross-sectional area
Effect of larger cross-sectional area
Lowers resistance
Fixed resistors characteristic
Fixed resistors characteristic
Specific values, key for stable designs
Variable resistor (potentiometer) use
Variable resistor (potentiometer) use
Adjustable resistance, e.g., volume control
Why resistors limit current
Why resistors limit current
Prevent component damage
Resistor function with voltage
Resistor function with voltage
Divides voltage amongst components
Resistor placement in circuit
Resistor placement in circuit
In series with supply and load