P:2 Electricity Paper 1
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Write a Definition of Current and What’s It Mesured in?
• Current is the Flow of Electrons around a circuit. • Current is Mesured in Amperes (A).
Write a Definition of Potential Difference and What’s it Mesured in?
• Potential Difference is the force driving the flow of electrons. • Potential Difference/ Voltage is Mesured in Volts (V).
Write a Definition of Resistance and What’s It Mesured in?
• Resistance is Everything that resists or opposes the flow of electrons. • Resistance is Mesured in Ohms (Ω)
Which Way does Current Flow In a Circuit?
• Current Always Flows from the Positive (Right) to negative (Left)
What Does the Current through a Component depend on?
• The current through a Component depend on both the Resistance (R) of the component and the Potential Difference across the component.
What happens if the Resistance is Greater?
• The greater the Resistance of the component the smaller the current for giving potential difference across the component.
What is The equation for Potential Difference?
• Potential difference (V) = Current (A) X Resistance (R).
What happens in some Resistors in Terms of value?
• the Values of Resistors should remain constant but t can change as current changers.
What Happens If the Current in an Ohmic Conductor Remains constant?
• The current in a Ohmic conductor (At a constant temperature) is directly proportional to the potential difference across the resistor.
What happens in the resistance in some components?
• The resistance in some components such as lamps, diodes, thermistors and LDRs is not constant it changes with the current through the component.
What happens in the resistance of a filament lamp?
• The Resistance of a filament lamp increases as the temperature of the filament lamp.
What happens in a Current through a Diode?
• The current through a diode flows in 1 direction only. the Diode has a very high resistance in the reverse direction.
What happens to the Resistance of a Thermistor if the temperature increases?
• The resistance of a thermistor decreases as the temp increases.
What Happens to the Light Intensity of the LDR Decreases?
• The resistance of an LDR Decreases as the light intensity increases.