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17 Cards in this Set
- Front
- Back
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Describe the difference between light globes connected in series and in parallel
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Series: divides the energy into 2 as they are in one circuit
Parallel: different because one of the lights is not on the main circuit |
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Describe the relationship between current leaving a power supply and current passing through 2 globes
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The current should hardly change
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What happens to the brightness of 2 globes if a 3rd globe is added?
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The brightness of the globes will be dimmer when the 3rd globe is added
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What happens to electricity when it flows through a light globe?
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gets converted to light, making it glow
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What happens to the size of current as the value of a resistor increases?
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it decreases
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What happens to brightness of a bulb as the size of a resistor increases?
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It dims
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What happens to brightness of a bulb as current increases?
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It gets brighter
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What does a resistor do?
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Controls the amount of energy going through
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Describe what happens to current in a circuit and brightness of a lamp as a slider moves.
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Brightness & current change
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Describe how a variable resistor works.
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The closer the slider is to the input, the lower the number coils that the current has to pass through reducing the resistance for the current, therefore making the light brighter
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List some uses of a variable resistors around the home.
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heater, some light switches, fans, hair straightner, stove, steamroom, hairdryer, shower, air conditioning, stereos
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A 9V torch battery produces a current of 1A. What is the resistance of the torch?
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9 ohms
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A car battery can produce a current of 2A flowing through a wire when the resistance is 6 ohms. what is the potential difference of the battery?
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12V
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Write down Ohm's law by writing the complete equation using ohms, volts and amps
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Volts (V) / Amp (A) = Ohms (O)
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Rewrite Ohm's law using current, resistance and potential difference
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Potential difference (V) / Current (A) = resistance (O)
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A student connects a bell into a circuit. She measures the current through the bell to be 6.2A and the voltage drop across the bell to be 2.3V. What is the resistance of the bell?
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0.37 ohms
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A student wants to meaure the current through and the voltage drop across a light globe in a circuit. Which of the following identifies the correct way to set up the meters:
a) both the ammeter and voltmeter in series with the globe b) both the ammeter and voltmeter parallel to the globe c) the ammeter in parallel to the globe and the voltmeter in series with the globe d) the ammeter in series with the globe and the votlmeter in parallel to the globe |
d
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