resistance of a wire practical Flashcards
what is current measured in
amps
what is pd measured in
volts
what is used to measure current
ammeter
what is used to measure potential difference
voltmeter
how should an ammeter be connected to determjnd the current rhoufh a component
in series
how should a voltmeter be connected to determine the potential difference across a component
in parallel
how could you tell if an ammeter of voltmeter have zero errors
they would show a reading when not connected in a circuit
when investigating length of wife and resistance what should be controlled
temperature, material of wire, thcikness of wire
how could temp be controlled when investiagting resistance
turn the power supply off between readings to prevent components warming up
what is the equation that links current potential difference and resistance
resistance = potential difference/ current
what is the unit for resistance
ohms ♎️
how would you know if your results were precise
measurements would be closely grouped together
what are the hazards in the experiment
the high current can cause the wite to get hot and melt, can also cause burns
what is the dv in the resistance of a wite investiagaation
resistance of the wire
what is the iv in the resistance of the wire practical
lenght of wire
what are the measurements taken in the investigation
the current and potential difference
whu should the variable resistor be adjusted each yime the lenght of the wire is changed
changes the resistance of the wite sk that current remains the same so thag the temp of the wire is kept constant
what effect does temp have on resistance of a wire
increase resistance
what effect would a thicker wire have on resistance
resistance would decrease
