Lightning and electrical injuries.

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What is the average width of a lightning bolt?

2-3cm.

20 to 30cm.

5-10cm.

50 to 60cm.

We perceive it to be wider because of its intensity and from the heated and ionised surrounding air.

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With a direct strike what is approximately the chance of being killed?

About 50%.

About 10%.

About 25%.

About 75%.

The DC current can cause asystole and respiratory paralysis.

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What is the "tip toe" sign in lightning injury?

It is a burn on the tip of your toe that is evidence of a direct strike.

It is a characteristic finding in people struck by lightning when swimming.

The burns you get if lightning has lifted you up into a "tip toe" position.

Small circular full thickness exit wounds.

The person in the photo had an entry wound on his left arm and tip toe exit wounds.

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How far ahead can a lightning bolt strike ahead of a storm?

50km.

15km.

2km.

5km.

It occurs when a cloud to ground flash starts in a cloud but travels horizontally away from the cloud before heading to the ground.

Hence the phrase "bolt from the blue".

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Roy Sullivan holds the Guinness Book of World Records for the most times a person has been struck by lightning and survived. How many times was he struck?

4 times.

7 times.

13 times.

42 times.

He was a park ranger and was struck 7 times between 1942 and 1977. He was nicknamed the "Human lightning rod" but tragically died by suicide in 1983.

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This child suffered a not uncommon burn called a "commissure burn". How did it happen?

Chewing on an electrical cord.

Child abuse with a cigarette.

A lightning injury when he had his mouth open.

Playing with an Apple i watch in his mouth.

These are from house hold power cords and are invariably full thickness burns and require plastics care. Burns to the tongue are also quite common.

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At the same voltage which is the most dangerous.

AC (alternating current).

DC (direct current).

AC/DC (band).

FC (full current).

At the same voltage AC is about 3 times more dangerous. This is because it can cause tetanic spasm when you hold the wire and can cause Ventricular Fibrillation at a low voltage. I made up full current.

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What advantage is there if at the electrical contact there is highly calloused skin?

None. It is in fact a disadvantage .The electricity just conducts through it.

An advantage because he high resistance means less conduction into the limb.

No advantage. No disadvantage.

Absolutely no idea.

A dry heavily calloused hand means high resistance and although there will significant heat created it will decrease the ongoing conduction.

V=IR

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Which of the following is NOT a recognised way of being injured by lightning?

Direct strike.

Side flash.

Ground current.

Ozoned.

Side flash is where the lightning hits a taller object then jumps to you. Ground current is, as it sounds, the current travels along the ground then into you.There may be a smell of ozone but that will not injure you.

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Which of the following is TRUE about "The lightning position"?

It decreases your chances of being struck by 40%.

It decreases your chances of being struck by 25%.

It decreases your chances of being struck by 60%.

It decreases your chances of being struck by 0%.

Most authorities would now say use the time to get to a clump of trees---fast.