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gcse science P4 - B
specific for ocr gateway additonal science B.
| Question | Answer |
|---|---|
| what is defibrillation? | a procedure to restore a regular hearth rhythm, by delivering an electric shock through the chest wall to the heart |
| how does defibrillation work? | -2 paddles are charged from a high voltage supply -placed firmly on patients chest, to ensure good electrical contact -electric charge passed through the patient to make their heart contract |
| what precautions are taken when using defibrillators? | -handles are insulated so that the person using the defibrillator doesn't get a shock -everyone is told to stand clear so that they don't get a shock |
| what is static electricity used in? | paint sprayers |
| how do paint sprayers work? | -spray gun is charged -paint becomes charged by the same charge, like charges repel, so the paint spreads out giving an even coat -item to be painted is given the opposite charge as the paint, opposite charges attract, so the paint sticks to the object |
| what happens if the object to be painted is not charged? | the object becomes charged from the paint, gaining the same charge, so paint droplets are repelled away from the object |
| what does a dust precipitator do? | removes harmful particles that pollute the atmosphere from the chimneys of factories and power stations |
| how does a dust precipitator work? step 1 | -wires are placed in the chimney and are given a large negative charge from a high-voltage supply |
| how does a dust precipitator work? step 2 | -as the soot particles pass close to the wires, they receive a negative charge |
| how does a dust precipitator work? step 3 | -like charges repel, so the soot particles are repelled away from the wires |
| how does a dust precipitator work? step 4 | they are attracted to the positively charged plates and stick to them |
| how does a dust precipitator work? step 5 | when the particles get big enough, they fall back down the chimney |
Created by:
jirwin
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