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Current/Resistance
Question | Answer |
---|---|
What is a series circuit? | Where two bulbs are connected one after another |
What is a parallel circuit? | The current coming from the battery splits up and some goes through each bulb. |
When a bulb blows in a series circuit the circuit ____ | is broken |
When a bulb blows in a parallel circuit the circuit ____ | is complete |
What is the symbol for current? | I |
What is current measured with? | Ammetre |
What is needed for current to flow? | Complete circuit |
What is the unit for voltage? | Volt |
What is the symbol for voltage? | V |
Calculate the resistance of the filament of a car headlamp when 12 V produces a current of 5 | 2.4 |
Why can you not use a piece of wood in a circuit as opposed to a piece of metal? | It is an insulator |
Resistance is measured by what value? | Ohms |
Explain V=IR | Voltage is equal to Current multiplied by resistance |
Explain the graph for V/I | Directionally proportional through the origin |
Explain the graph for I/V | Indirectly proportional |
When a switch is closed in a circuit, what is observed? | Current flows |
Name the instrument used to measure voltage | voltmetre |
State Ohm’s law | I = V/R |
Name an essential component of a circuit | Battery |
What is the unit of current? | Amp |