GCSE Physics and combined science
Help!
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| Draw the circuit symbol for a switch | Draw
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| Draw the circuit symbol for a closed switch | Draw
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| Draw the circuit symbol for a cell | Draw
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| Draw the circuit symbol for a battery | Draw
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| Draw the circuit symbol for a diode | Draw
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| Draw the circuit symbol for a resistor | Draw
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| Draw the circuit symbol for a variable resistor | Draw
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| Draw the circuit symbol for an LED | Draw
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| Draw the circuit symbol for a lamp | Draw
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| Draw the circuit symbol for a fuse | Draw
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| Draw the circuit symbol for a voltmeter | Draw
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| Draw the circuit symbol for an ammeter | Draw
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| Draw the circuit symbol for a thermistor | Draw
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| Draw the circuit symbol for an LDR | Draw
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| State the rule for current in a series circuit | the current is the same at every point in the circuit and in every component
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| State the rule for potential difference in a series circuit | the total potential difference of the power supply is shared between components
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| State the rule for resistance in a series circuit | the more resistors, the greater the resistance. RT=R1+R2
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| State the rule for current in a parallel circuit | the total current through the whole circuit is the sum of the currents through the separate components
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| State the rule for potential difference in a parallel circuit | the potential difference across each branch in the circuit is the same
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| State the rule for resistance in a parallel circuit | adding more resistors in parallel decreases resistance
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| What colour is the live wire in a three core cable? | brown
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| What colour is the neutral wire in a three core cable? | blue
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| What colour is the earth wire in a three core cable? | green and yellow
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| The brown wire in a plug is the _______ | live
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| The blue wire in a plug is the ________ | neutral
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| The green and yellow wire in a plug is the ________ | earth
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| The potential difference between the live wire and others in the plug is _____ V | 230V
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| Current flows into an appliance through the _______ wire | live
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| Current flows out of an appliance through the ______ wire | neutral
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| The _________ wire is a safety feature of appliances | earth
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| Potential difference between the neutral wires and others in the plug should be ____ V | 0V
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| Electric Current is….? | the flow of electric charge
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| Potential difference between two points in a circuit is….? | the work done when a couloumb of charge passes between the points.
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| In a circuit the potential difference causes …..? | charge to flow
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| Resistance is…? | caused by anything which opposes the flow of electric charge
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| Particles which can be 'charges' in electric circuits are… | electrons or ions
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| What is a series circuit? | A circuit with only one route for charge to flow
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| What is a parallel circuit? | A circuit with more than one route for charge to flow
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| State the equation which links charge flow, current and time | Q=It
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| State the equation which links current, potential difference and resistance | V=IR
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| State the equation which links current, potential difference and power | P=IV
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| State the equation which links current, power and resistance | P=I2R
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| State the equation which links energy transferred, power and time | E=Pt
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| State the equation which links charge flow, energy transferred and potential difference | E=QV
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| What is the unit of charge flow? | Coulomb ( C )
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| What is the unit of current? | Amps (A)
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| What is the unit for potential difference? | Volts (V)
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| What is the unit for resistance? | Ohms (Ω)
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| What is the unit for power? | Watts (W)
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| Draw the I-V characteristic for a fixed resistor | teacher to draw on board…
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| Draw the I-V characteristic for a filament lamp see | teacher to draw on board…
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| Draw the I-V characteristic for a diode | teacher to draw on board…
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| Describe the I-V characteristic for a fixed resistor | Current and potential difference are directly proportional, resistance is constant
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| Describe the I-V characteristic of a filament lamp | Resistance is not constant, it increases as p.d. increases
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| Explain why resistance increases with increased p.d. in a filament lamp | temperature increases causing ions to vibrate and increasing collisions with electrons flowing through the filament
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| Describe the I-V characteristic of a diode | The current only flows through the diode in one direction, there is a very high resistance in the reverse direction.
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| Current which regularly changes direction is called… | alternating current
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| An example of alternating current is…? | mains electricity
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| Current which flows in one direction is…? | direct current
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| An example of direct current is… | batteries
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| What is the potential difference of mains electricity in the UK? | 230V
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| What is the frequency of the alternating current in UK mains electricity? | 50Hz
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| The national grid consists of…? | Cables and transformers
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| Are power stations par of the national grid? | no
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| What does a step up transformer do? | Increases p.d.
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| What does a step down transformer do? | reduces p.d. to 230 V
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| Why are transformers used? | reduce current so that less heat is lost in cables, increases efficiency
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Created by:
JBearfield
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