Just for reference.

How much will coronavirus cost the UK?

We won't know how big the final bill will be until after the crisis is over. But the government will certainly have to borrow enormous amounts of money because it is spending more than it is taking in from tax.

On 25 November, the Office for Budget Responsibility (OBR), which keeps tabs on government spending, estimated that borrowing would be £394bn for the current financial year (April 2020 to April 2021).

That's the highest figure ever seen outside wartime.

The government borrows money by selling bonds.

A bond is a promise to make payments to whoever holds it on certain dates. There is a large payment on the final date - in effect, the repayment.

Interest is also paid to whoever owns the bond in the meantime. So it's basically an interest-paying "IOU".

The buyers of these bonds, or "gilts", are mainly financial institutions, like pension funds, investment funds, banks and insurance companies.

Private savers also buy some.

The Rothschild family is a wealthy Jewish family originally from Frankfurt that rose to prominence with Mayer Amschel Rothschild, a court factor to the German Landgraves of Hesse-Kassel in the Free City of Frankfurt, Holy Roman Empire, who established his banking business in the 1760s.

Cause and effect is a relationship between events or things, where one is the result of the other or others. This is a combination of action and reaction.

Input/output refers to the information that is passed into or out of a computer. [computing] 2. uncountable noun. Input/output refers to the hardware or software that controls the passing of information into or out of a computer.

late Middle English: via Old French from Latin circuitus, from circuire, variant of circumire ‘go round’, from circum ‘around’ + ire ‘go’.

verb: circuit; 3rd person present: circuits; past tense: circuited; past participle: circuited; gerund or present participle: circuiting

lap
turn
tour
round
circle
orbit
revolution
loop
beat

verb: beat; 3rd person present: beats; past tense: beat; gerund or present participle: beating; past participle: beaten

1.
strike (a person or an animal) repeatedly and violently so as to hurt or injure them, typically with an implement such as a club or whip.

B E A T E N

B E A T I N G

be Aten

Beat in G

beating (n.)
c. 1200, beatunge "action of inflicting blows," verbal noun from beat (v.). Meaning "pulsation" is recorded from c. 1600.
Nautical sense of "sailing against the wind" is by 1883.

From Middle French pulsacion, and its source, Latin pulsātiō (“a beating or striking”).

pulsation (countable and uncountable, plural pulsations)

The regular throbbing of the heart, an artery etc. in a living body; the pulse. [from 15th c.]

Any rhythmic beating, throbbing etc. [from 17th c.]

(now rare) Physical striking; a blow. [from 17th c.]

A single beat, throb or vibration. [from 19th c.]

Borrowed from Latin pulsāre, present active infinitive of pulsō. Doublet of the inherited pujar.

Verb
pulsar (first-person singular present pulso, first-person singular preterite pulsé, past participle pulsado)

to press (a button, etc.)
pulsar un botón ― to press a button
(computing) to click (to press and release a button on a computer mouse)
to pulsate

pulse (third-person singular simple present pulses, present participle pulsing, simple past and past participle pulsed)

(transitive, also figuratively) To emit or impel (something) in pulses or waves.

From Late Middle English pulse, Middle English pous, pouse (“regular beat of arteries, pulse; heartbeat; place on the body where a pulse is detectable; beat (of a musical instrument); energy, vitality”) [and other forms],

from Anglo-Norman puls, pous, pus, and Middle French pouls, poulz, pous [and other forms], Old French pous, pulz (“regular beat of arteries; place on the body where a pulse is detectable”) (modern French pouls), and from their etymon Latin pulsus (“beat, impulse, pulse, stroke; regular beat of arteries or the heart”), from pellō (“to drive, impel, propel, push; to banish, eject, expel; to set in motion; to strike”) (ultimately from Proto-Indo-European *pel- (“to beat, strike; to drive; to push, thrust”)) + -sus (a variant of -tus (suffix forming action nouns from verbs)).

(figuratively) The focus of energy or vigour of an activity, place, or thing; also, the feeling of bustle, busyness, or energy in a place; the heartbeat.

You can really feel the pulse of the city in this district.

(music, prosody) The beat or tactus of a piece of music or verse; also, a repeated sequence of such beats.

(physics)
A brief burst of electromagnetic energy, such as light, radio waves, etc.

Synonym of autosoliton (“a stable solitary localized structure that arises in nonlinear spatially extended dissipative systems due to mechanisms of self-organization”)
(also electronics) A brief increase in the strength of an electrical signal; an impulse.

electromagnetic pulse

An electromagnetic pulse, also sometimes called a transient electromagnetic disturbance, is a short burst of electromagnetic energy.

Such a pulse's origin may be a natural occurrence or man-made and can occur as a radiated, electric, or magnetic field or a conducted electric current, depending on the source.

Weapons have been developed to deliver the damaging effects of high-energy EMP.

An EMP arises where the source emits a short-duration pulse of energy. The energy is usually broadband by nature, although it often excites a relatively narrow-band damped sine wave response in the surrounding environment. Some types are generated as repetitive and regular pulse trains.

An electromagnetic pulse is a short surge of electromagnetic energy. Its short duration means that it will be spread over a range of frequencies. Pulses are typically characterized by:

The type of energy (radiated, electric, magnetic or conducted).
The range or spectrum of frequencies present.
Pulse waveform: shape, duration and amplitude.
The last two of these, the frequency spectrum and the pulse waveform, are interrelated via the Fourier transform and may be seen as two ways of describing the same pulse.

EMP events usually induce a corresponding signal in the surrounding environment or material. Coupling usually occurs most strongly over a relatively narrow frequency band, leading to a characteristic damped sine wave. Visually it is shown as a high frequency sine wave growing and decaying within the longer-lived envelope of the double-exponential curve.

A damped sinewave typically has much lower energy and a narrower frequency spread than the original pulse, due to the transfer characteristic of the coupling mode. In practice, EMP test equipment often injects these damped sinewaves directly rather than attempting to recreate the high-energy threat pulses.

In a pulse train, such as from a digital clock circuit, the waveform is repeated at regular intervals. A single complete pulse cycle is sufficient to characterise such a regular, repetitive train.

Types of natural EMP event includes:

Lightning electromagnetic pulse (LEMP). The discharge is typically an initial huge current flow, at least mega-amps, followed by a train of pulses of decreasing energy.
Electrostatic discharge (ESD), as a result of two charged objects coming into close proximity or even contact.

Coronal mass ejection (CME), sometimes referred to as a solar EMP. A burst of plasma and accompanying magnetic field, ejected from the solar corona and released into the solar wind.

Types of (civil) man-made EMP event include:

Switching action of electrical circuitry, whether isolated or repetitive (as a pulse train).

Electric motors can create a train of pulses as the internal electrical contacts make and break connections as the armature rotates.

Gasoline engine ignition systems can create a train of pulses as the spark plugs are energized or fired.

Continual switching actions of digital electronic circuitry.
Power line surges.

Types of military EMP include:

Nuclear electromagnetic pulse (NEMP), as a result of a nuclear explosion. A variant of this is the high altitude nuclear EMP (HEMP), which produces a secondary pulse due to particle interactions with the Earth's atmosphere and magnetic field.
Non-nuclear electromagnetic pulse (NNEMP) weapons.

A nuclear electromagnetic pulse is the abrupt pulse of electromagnetic radiation resulting from a nuclear explosion.

The resulting rapidly changing electric fields and magnetic fields may couple with electrical/electronic systems to produce damaging current and voltage surges.

The intense gamma radiation emitted can also ionize the surrounding air, creating a secondary EMP as the atoms of air first lose their electrons and then regain them.

🤔 Maybe I should have made my Faraday Cage when I was researching it.