POWER STORAGE DETAILS Block diagram: The voltage generated by the source (generator) is not of pure dc. This has to be rectified before storage. A diode rectifier then provides a full-wave rectified voltage that is initially filtered by a simple capacitor filter to produce a dc voltage. Block diagram (Power supply) Working principle: The Full Wave Bridge Rectifier Full Wave Bridge Rectifier uses four individual rectifying diodes connected in a closed-loop "bridge" configuration to produce the desired output. The main advantage of this a bridge circuit is that it does not require a special center-tapped transformer, thereby reducing its size and cost. The single secondary winding is connected to one side of the diode bridge network and the load to the other side as shown below. The Diode Bridge Rectifier The four diodes labeled D1 to D4 are arranged in “series pairs” with only two diodes conducting current during each
A well-balanced meal should contain all the macro-nutrients required for optimum health and to maintain the cells, tissues, and functions of the body. These nutrients include protein, carbohydrate and a regulated amount of healthy unsaturated fat.
Ideally, a well-balanced meal should
It also includes a variety of vitamins and minerals.
The
importance of eating a well-balanced meal
It is important to eat well
balanced meals most of the time to ensure that your overall diet is also
balanced, and that you are getting all the vitamins and minerals required for a
healthy body. Eating healthy, balanced meals will also provide you with
plenty of long-lasting energy and keep you full for longer. Obviously, it is not
always possible to eat a completely nutritionally balanced plate of food at
every meal, but if you aim for a balanced the majority of the time, you will
end up with a nutritionally complete diet overall.
Try to ensure that each meal
contains at least a protein source, carbohydrate and fruit, and
vegetables. It is not necessary, and in fact would be almost impossible,
to consume every nutrient in every meal, so try to look at your diet as a whole
over a more long term time frame, and keep your diet varied. Try new
foods and look for new recipes and interesting ways of changing your diet.
The USRDA recommends that a balanced
meal should be made up of half fruit and vegetables, a quarter with protein and
the remaining quarter carbohydrates. A serve of low-fat dairy is also
recommended. It is also suggested that sodium intake should be reduced,
less than 10% of fat intake should be from saturated sources and solid fats
should be limited as should refined grains and alcohol.
Protein
Protein is essential in the body,
not only to keep us full longer, but also to provide essential amino acids that
are used in the body to regenerate protein in the body.
Most Americans eat too much
protein, so try to ensure that the protein portion of your meal only occupies
about a quarter of your plate at most. A serve of meat, for example, should
be about the size and thickness of a pack of playing cards.
There are two main sources of
protein. The first is high quality or complete protein, such as meat,
poultry, fish, milk, eggs, and cheese. These contain all the essential
amino acids. The second class is the incomplete proteins, which provide
adequate amounts of amino acids, but not all of them. These include beans
and other legumes, rice, tofu, and other vegetarian protein sources.
Due to their incomplete nature, to
obtain all the necessary amino acids from non-animal sources, it is important
to eat a combination of these foods together. For example, beans
and rice will provide all amino acids when eaten together, as each is rich in
different acids.
It is also important to choose low-fat sources of protein. Choose lean cuts of meat and remove any visible
fat and chicken skin. Cook using low-fat methods such as grilling or
baking, or fry in a small amount of olive or vegetable oil.
Carbohydrates
Carbohydrates provide us with the
energy our body needs, in addition to important B group vitamins and
fiber. Diets that eliminate or drastically reduce carbohydrates may leave
you lacking in energy. Rice, pasta, bread, and potatoes are all excellent
sources of carbohydrates.
Try to choose wholegrain or brown
varieties for increased fiber and longer-lasting energy and try to avoid
refined carbohydrates sources such as cakes. Low GI carbs
such as sweet potatoes are a good alternative to potatoes to keep blood sugar
levels more level.
Fats
Although fats are often portrayed
as a food to avoid, we do in fact need some fat in our diet. Choose
unsaturated fats such as olive oil, vegetable oils and margarine for cooking,
or include some healthy fat foods such as avocados and nuts in your diet.
These healthy fats help to prevent the build-up of cholesterol in the blood and
also, contribute valuable fat-soluble vitamins.
To maintain a healthy
weight, however, we do need to watch our fat intake. Try to cook with
minimal added fat, switch to low-fat dairy products and stay away from high fat
products such as cakes and fried food, particularly if you are watching your
weight.
Vitamins
and Minerals
Vitamins and minerals play a vital
part in the healthy function of our bodies. Different types of foods
provide different vitamins, which is why it is essential to eat a variety of
different foods. Fruit and vegetables are packed full of vitamins and minerals,
and in addition to being low in calories and fat and high in fiber, this makes
them a very important part of a healthy diet.
Try to
fill half your plate with vegetables at a meal. If this is
difficult, eat slightly fewer vegetables and have a piece of fruit for dessert.
Eating more high fiber vegetables is a great way to fill up without
loading your body with unwanted calories. It is important to remember
however those potatoes, whilst technically vegetables, are really part of the
carbohydrate group and should not be part of your vegetable intake for the day.
What does a
healthy meal look like?
Here are some balanced meal ideas to help you get started.
Balanced Breakfast Ideas:
- Wholegrain breakfast cereal with low-fat milk, fresh fruit and low-fat yogurt
- Wholegrain toast with scrambled eggs, low fat cheese, baked beans, and fresh fruit salad.
- Porridge oats made with low-fat milk topped with bananas, sultanas and a small handful unsalted nuts
- Fruit smoothie with low-fat milk, with peanut butter on wholegrain toast.
Lunch Ideas
- Wholegrain bread sandwich with a low-fat filling such as turkey or tuna, with fresh fruit, green salad, and low-fat yogurt.
- Veggie burger (with beans or tofu) on whole-grain bread, with roasted vegetables (minimal oil) and fresh fruit.
- Wholegrain pita pockets stuffed with tuna or hummus, salad and low-fat cheese served with pumpkin soup made with low-fat milk.
Balanced Dinner Ideas
- Oven baked fish with roasted vegetables and potatoes, low-fat yogurt garlic sauce and fresh fruit.
- Bean and vegetable stew with brown rice and low-fat frozen yogurt
- Whole wheat pasta with a tomato-based sauce, tuna, and roasted vegetables, topped with parmesan cheese, with fresh fruit and low-fat dairy dessert.
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