Petrol or diesel buyacar gas pressure definition chemistry

#########

Aside from cost, there’s also the engine’s performance to consider. Diesel engines often feel more powerful than petrol engines because you don’t have to rev the engine hard to get the best performance. This makes them great for towing and powering big cars like SUVs. wb state electricity board bill pay Many of the very latest cars are also considerably cleaner than those that went before them.

If your next car is only going to be used for low-speed journeys – across town, for example – then it’s almost always best to opt for a petrol car. In these cases, a petrol car is likely to be cheaper anyway, but it’s also likely to be more reliable than a diesel car in these circumstances: modern diesels need regular high speed runs (on motorways or dual carriageways) to keep their systems working.

It’s because diesel engines produce higher levels of harmful emissions than petrol engines and these include particulates: microscopic soot particles that can embed themselves into lungs, where they can cause breathing difficulties. To reduce these emissions, modern diesel car exhausts are fitted with diesel particulate filters (DPFs), which trap the harmful particles. electricity symbols ks2 worksheet When these filters are full, the trapped particles need to be burnt off.

The car’s onboard computers recognise when this is needed and change the engine settings so that the exhaust gas is hotter than usual. gas guzzler tax This is easily done when driving at high speeds, but can be impossible during town driving. That’s why the filters in low mileage cars often get clogged, requiring a visit to the dealer and sometimes costly repair work.

Pure electric cars are the top eco choice with no exhaust emissions and cheap electricity top-ups, particularly if you plug in at home. The range of cars on a single charge is rapidly improving; the latest Nissan Leaf can cover more than 135 miles before the batteries dip alarmingly low, and the new Jaguar I-Pace (above) will go beyond 200 miles. Smaller cars, including the Renault Zoe will cover at least 100 miles before needing to be recharged. Electric cars are ideal for short distances but, due to their slightly higher purchase price, are more likely to offer savings to long-distance commuters, particularly if they can recharge at work.

Plug-in hybrid cars can also bring substantially lower fuel costs, but only for shorter journeys of between 20-25 miles. electricity measurements units When fully charged, these vehicles can typically cover that distance on electric power alone. 4 gases in the atmosphere After this, a petrol or diesel engine takes over; the more this is used, the less you’ll save, compared with a conventional car. Not everyone can save with these cars, due to their higher purchase price and limited electric range.

Standard hybrid cars can be little more expensive than a standard model, but bring reasonable fuel savings; particularly in stop-start traffic. They can’t be plugged in, and so the batteries are recharged by recovering energy that would usually be lost during braking. electricity tower vector The engine is also used for recharging when it’s efficient to do so. The electricity drives a motor for power at very low speeds and to assist a standard petrol or diesel engine during acceleration. Long journeys at steady speeds don’t play to the strengths of a hybrid system, as there’s little energy to recover.