23.1 – Investigating Current and Voltage in a Filament Lamp (Leaving Cert Physics): Flashcards

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23.1 – Investigating Current and Voltage in a Filament Lamp
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Type of conductor a filament lamp is

Non-ohmic conductor

I-V graph shape for a filament lamp

Curved line

I-V graph shape for an ohmic conductor

Straight line

Why a filament lamp is non-ohmic

Its resistance changes with temperature

Effect on filament when voltage increases

Heats up and resistance increases

How to connect an ammeter in the circuit

In series with the bulb

How to connect a voltmeter in the circuit

In parallel with the bulb

Purpose of variable resistor/rheostat

Control voltage and current in circuit

I-V curve slope at low voltages

Steep

I-V curve slope at high voltages

Flattens/gradual

Why I-V curve is steep at low voltage

Filament cool, low resistance

Why I-V curve flattens at high voltage

Filament hot, high resistance

Max temperature tungsten filament can reach

Over 2000°C

Axes for I-V graph (current and voltage)

II on y-axis, VV on x-axis

Formula for calculating resistance

R=VIR = \frac{V}{I}

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