Automobile helps people reach their destination easily. It can makes people comfortable in their travel. The only negative of it is it will contribute pollution. It will add up expenses also.
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negative: it uses power. Positive: you can google how to save the Envroment and save power
It's a power supply with a positive and negative voltage, where one of the voltages tracks the other. For example: the negative voltage tracks the positive. If you regulate the positive to 15v, the negative is going to be -15v. This allows very precise symmetric power.
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Black for negative and red for positive.
A negative effect is any result of an action which is perceived to be detrimental. This means its a subjective opinion. What might be negative to you may be positive to someone else.