Term
| What are the two types of transformer? |
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Definition
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Term
| what type of current passes through a transformer? |
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Definition
| alternating current (a.c) |
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Term
| what is the core of a transformer made of? |
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Definition
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Term
Which type of transformer makes the potential difference greater? |
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Definition
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Term
| how can you increase the potential difference? |
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Definition
| adding more coils/ larger current |
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Term
| why is alternating current needed? |
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Definition
| to act as a moving magnet |
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Term
| which type of transformer makes the current bigger? |
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Definition
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Term
| what is the equation that relates the potential difference to the number of coils? |
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Definition
voltage across primary coil = # of primary coils voltage across secondary coil #of secondary coils |
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Term
| why is an insulated wire used in the coils as opposed to an uninsulated wire? |
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Definition
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Term
| Which type of transformer is used between a power station and the national grid? |
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Definition
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Term
| Why is a step up transformer used before the grid? |
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Definition
| to lower the current to prevent the wire heating up and melting/wasting power |
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Term
| what type of transformer is used between the grid and homes? |
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Definition
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Term
| how can you tell is a transofrmer is step-up by looking at it? |
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Definition
| a step-up transformer will have more secondary coils than primary |
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Term
| how can you tell if a transformer is step down? |
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Definition
| it has more primary coils than secondary |
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